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{{trope}}
{{quote|"The issue in an ongoing series is once you've done it [used [[Time Travel|time travel]]] and it wasn't a fluke, it's like you've shown that one of your characters got [[Superman (Franchise)|Superman]] powers. And then in the next episode when a building is about to fall over on someone, Superman's running around in circles saying "Oh no what do we do? Frig frig frig" and the audience is sitting there, furrowing their brows, one hand on their chin."|''[[Alt Text]] for [[Dinosaur Comics (Webcomic)|Dinosaur Comics]], [http://www.qwantz.com/index.php?comic=1307 9/18/08]''}}
 
A situation, most common in [[Speculative Fiction]], where an amazingly useful power or device is revealed in one episode, and would be amazingly useful in later episodes, if it weren't for the fact that nobody seems to remember it. Sometimes the power or device is remembered under circumstances where it proves mostly useless, but not remembered when it would do any good.
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Not to be confused with [[We Have Forgotten the Phlebotinum]]. If they (finally!) remember to use it in the end, it's a [[Forgotten Superweapon]].
 
This trope does not necessarily denote bad writing. It can be (as noted in the ''[[The Order of the Stick (Webcomic)|Order of the Stick]]'' example) convenient writing instead. If the protagonists have some piece of phlebotinum that makes them invincible or at least very hard to so much as injure that is both reliable and accessible, [[Drama-Preserving Handicap|vast numbers of plots have to be thrown out the window.]] Some would call this unwillingness to change the [[Status Quo Is God|Status Quo]] and then adapt to the new order of things "lazy", but when one is working on a regular series, changing the status quo (interesting though it can be dramatically) is not something to be done lightly. When it's a [[Shared Universe]] this is even more pronounced. In such cases, [[Forgotten Phlebotinum|"Forgotten" Phlebotinum]] is a subtrope of [[Real Life Writes the Plot]].
 
[[Larry Niven]] is extremely critical of this trope, and coined Niven's Law, which states that once a technology or discovery has been introduced into a fictional setting, it must continue to exist in all chronologically later stories in that setting. The secret may be lost for a variety of reasons--society enters a dark age, the discoverer deliberately covers it up, or there really were [[No Plans, No Prototype, No Backup]]--but Niven would maintain that this smacks of lazy writing and is best avoided. At the very least, the precedent that such a machine is ''physically possible'' in the setting must be maintained--which makes it likely that older, [[Higher-Tech Species]] will possess it even if it never became prevalent in the protagonists' society.
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* One of [[Doraemon]]'s early [[Monster of the Week|gadgets of the week]] (chapter 54, "Lies Become Truths") was a beak-like toy which one could wear, and anything uttered while using it will be spontaneously proven as fact. Nobita lied that his father can shatter a huge rock with his bare hand, and then he can do it with ease. Quite frankly this should have make any other gadget Doraemon had introduced, or will ever introduce, completely and utterly obsolete. It was never mentioned again ever since. Particularly frustrating in ''Doraemon'' feature films and volume-length comics, which featured life-threatening situations.
** This is not uncommon in Doraemon. There are several predicaments that Doraemon and co. face that one of his gadgets that have been mentioned in previous episodes could have easily get them out but for some reason Doraemon seems to have to use the gadget that was introduced in episode they were in.
* ''[[Tekkaman Blade (Anime)|Tekkaman Blade]]'' gives us the Hi-Coat Voltekka, an upgrade to Blade's Voltekka. It's used once in it's introduction episode to defeat Evil and then again three episodes to shoot down a nuke. Then the time skip happens and it's not seen again.
* ''[[Tengen Toppa Gurren Lagann (Anime)|Tengen Toppa Gurren Lagann]]'': The Gurren Lagann is equipped with a powerful [[Deflector Shield]], which stops [[Combat Pragmatist]] enemies from attacking it in the middle of its formation, as well as stopping any powerful attacks thrown at it. It only appears in episode 3 and is promptly forgotten for the rest of the series, where it could have been very useful. (It reappears in the [[Compilation Movie]], however.)
* In ''[[Digimon Adventure (Anime)|Digimon Adventure]]'', there were several instances in which Gomamon's Marching Fishes technique could have come in handy, especially since he was seen in the first episode carrying the entire group down a river on the fishes.
 
 
== [[Comic Books]] ==
* Silver Age [[Superman]]'s lead-glass suit. It's flexible, bulletproof, doesn't cover up the "S", and is impervious to kryptonite radiation. It shows up in ''one'' issue.
** ''[[Superman: theThe Animated Series]]'' uses it, but makes it even more useful by turning it into an effective (if short-term) spacesuit (Superman can survive in a vacuum, but can't breathe in one, in the animated series). It is, however, noticeably more fragile than Superman himself, so while he uses it often, he's not reliant on it.
** The suit reappeared for a story arc of ''Batman/Superman'' somewhat recently.
** The [[Silver Age]] had ''tons'' of [[Forgotten Phlebotinum]]. Fo example, there is ''Action Comics'' #252, an issue otherwise better known for being Supergirl's first appearance. In the lead-in story, though, Superman is being menaced by kryptonite, and he escapes by melting it with his heat vision, at which point he learns the liquid kryptonite is no longer harmful. (In a real head against wall moment, he even says that it's because when items change their state, they lose other properties, like how ice, when it melts into water, [[Critical Research Failure|stops being cold]]. Of course, Superman forgets that liquid kryptonite is harmless to him thereafter, and in fact, liquid ''and gaseous'' kryptonite are shown being harmful to him in later stories. [[It Only Works Once|So maybe he found the only chunk of kryptonite in the universe that would be harmless to him if it were liquid.]]
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* ''[[X-Men (Comic Book)|X-Men]]'': Rogue can't have a relationship with anyone due to her powers. Gambit's mutant powers used to allow him to touch her without an issue, which has since been forgotten. In addition, there have been numerous items that temporarily disabled mutant powers, many of which have been captured by the X-Men, these are never mentioned in relation to this issue.
* In ''[[Spider-Man (Comic Book)|Spider-Man]]'', Peter makes a gas mask for himself that is completely concealed by his Spider-Man suit; he uses it once and never again, even though he is regularly hit with gas attacks several times during the early run of the comic.
** The loathed ''[[One More Day]]'' storyline. Aunt May is dying (well, she's only been in her mid-80's for a few decades now, but she was actually injured). Subverting this trope, Peter scours half the mainstay Marvel cast looking for someone that can heal her. Playing this trope straight, ''nobody can''. There's very, VERY thinly implied instances where it's the fact that she's already so old and frail that conventional medicine can't heal her, but considering the fact that those who he approaches include the X-Men (who had no fewer than 3 people at the time whose powers could explicitly heal any wound), [[Reed Richards Is Useless|Reed Richards]], and Doctor Strange - who is both the Sorcerer Supreme and a former neurosurgeon, there's no reason that SOMEONE couldn't have helped him before he ended up [[Deal Withwith the Devil|letting Mephistopheles wipe out the entire history of his marriage in exchange for Aunt May's life]].
 
 
== [[Film]] ==
* The "throwing 'S' shield" in ''[[Superman II]]''. During a fight which occurs just before the climax, Supes ''rips off a copy of the 'S' emblem on his chest'' and uses it to temporarily incapacitate Non (one of the escaped Kryptonians). It's never explained how Clark does this, and he never uses it again in the following films. It sure would have come in handy against [[Superman III|the evil Clark]] or [[Superman IV: theThe Quest For Peace|Nuclear Man]], even if it was a cheap-looking effect.
* In ''[[Star Trek: First Contact (Film)|Star Trek First Contact]]'', the invading Borg are able to create a "temporal vortex" to travel back in time to the 21st century. At the end of the movie, the Enterprise is able to easily recreate this effect to travel back to their own time. This method of time travel seems easier and much safer than the other established method of sligshotting around a star at warp 10, but it's never mentioned again.
* At the end of ''[[Star Trek Nemesis (Film)|Star Trek Nemesis]]'', all the transporters on the Enterprise fail after Picard is beamed over. Their only recourse is to have Data ''jump'' over and use a never-before-seen one-person mini-transporter badge to get Picard back and them die with the enemy ship himself. Everyone seemed to forget ''the shuttles have their own independent transporters''.
** ''Insurrection'' and ''Nemesis'' also subverted this with the Captain's Yacht, a large auxillary starship (attached to the underside of capital ships) that was designed for both ''The Next Generation'' and ''Voyager'', but was never used in either series. Despite many situations where a craft like this could be useful (as it could carry more crew members, have a larger cargo area and generate tachyon bursts), the craft wasn't utilized until ''Insurrection'' (where the main cast go down in the yacht to deliver weapons to the Ba'ku) and ''Nemesis'' (where Picard arbitrarily decides to take it down to the planet where B4-4's parts are located).
 
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* The ''[[Grey Griffins]]'' books forget their phlebotinum all the frigging time. All the time. Other times they [[Holding Back the Phlebotinum|hold it back]]. Max can sense portals and enter them... wait, now he can't, except when he suddenly needs to warp into one much later. Max has a pet "spriggan" that he cares deeply about. Where'd it go, and how come neither Max nor the book cares? You get the idea. Contributes to the [[Random Events Plot|randomness of the plot]].
* A very subtle version of this happens in L. E. Modesitt's ''Spellsong Sorceress'' cycle. In the first chapters of the first book, a spell is cast that teleports the main character in from Earth. It's implied that although the lady casting this spell isn't a very strong sorceress, she can still send people to locations halfway across the continent with a bit of help. This use of magic is never mentioned again, despite the fact that it would be tremendously useful in a variety of circumstances.
* ''[[Harry Potter (Literaturenovel)|Harry Potter]]'': Sirius' two-way mirror, which is basically a magical walkie-talkie. In Harry's defense, he was never told exactly what it was, and swore never to use it for fear it would cause Sirius to come to Hogwarts and get arrested and/or killed. It still qualifies as forgotten phlebotinum, however, because even after Harry has gone through great risk to speak to Sirius through Umbridge's fire, it didn't occur to Sirius to tell him "Next time, use the mirror I gave you." which would have {{spoiler|saved his life}}.
** In ''[[Harry Potter (Franchise)/Harry Potter and the Deathly Hallows|Harry Potter]]'', Harry and his friends escape from the {{spoiler|Malfoy}} mansion. At one point, Harry ends up with three wands in his hand, which he holds bundled together. When he attempts to Stupefy someone, his target is "lifted off his feet by the triple spell." However, every character is usually content to wield a single wand. No one habitually Spellotapes a few wands together for extra blasting power, no wandmaker designs multi-core wands - nothing of the sort.
* Science Fiction author [[Larry Niven]] coined "Niven's Law," which states that once a technology is introduced into a setting, it must continue to be present in all later stories in that same setting.
** Civilization-wide Forgotten Phlebotinum can be somewhat justified if there are [[No Plans, No Prototype, No Backup]], or if the civilization enters a Dark Age when lots of stuff is forgotten, but Niven's Law is still a good rule of thumb. At any event, once the technology has been proven to work once, then the natural laws which permitted it to happen must remain consistent from then on, regardless of whether the tech is ever rediscovered.
* In the [[Star Trek Novel Verse (Franchise)|Star Trek Novel Verse]], the phase-cloak seems to go through this a lot. After its introduction (and successful use) in an episode of ''[[Star Trek: theThe Next Generation (TV)|Star Trek the Next Generation]]'', it's largely ignored by the books (as well as later TV series). A short story in a ''[[Star Trek: New Frontier (Literature)|Star Trek New Frontier]]'' anthology eventually suggested the prototype was destroyed soon after the episode. By the time of ''[[Star Trek the Genesis Wave]]'', the Romulans are making use of the technology again, or something very much like it, but then it drops off a second time, and when ''[[Star Trek Titan]]'' comes round no-one's using it. Finally, in the ''[[Star Trek Typhon Pact]]'' series, we're explicitly told the Romulans have finally perfected it.
** At least in ''The Next Generation'', it was mentioned that the Federation had negotiated away its right to use cloaking technology in a treaty with the Romulans, making the Federations research into the phase-cloak illegal (i.e., a treaty violation that could lead to war with the Romulans). The episode showing the Romulans were working on it themselves showed that it was giving them trouble, and the illegal Federation project Riker had been a part of had not ended well either.
* The Grav Lance in the ''[[Honor Harrington (Literature)|Honor Harrington]]'' series is a key plot point in the first book, and is then never mentioned again. Considering how much other technology advances over the course of the books (about 20 years in universe), you'd think they could have worked out the glitches of a weapon that can one hit the shields of any size of ship, up to and including a [[Mighty Glacier|superdreadnought]].
** A combination of a very short range<ref>best suited to stealthy, small vessels</ref>, massive size<ref>anything but the largest vessels have to sacrifice too much of their other armament to mount one</ref>, which requires a use that doesn't fit with the prevailing tactical ideology -- and a political climate<ref>its sponsor lost favour, and its debut performance generated massive bad feeling amongst the other powers-that-be</ref> which would prevent time and money being spent on fixing those problems? Not really surprising it never reappears.
 
 
== [[Live Action TV]] ==
* ''[[Star Trek: theThe Original Series (TV)|Star Trek the Original Series]]'' was notorious for this. When the Enterprise crew discovered kironide, a [[Aesoptinum|drug that gives people psychic powers]] (in "Plato's Stepchildren"), why wasn't this made a standard part of the medical kit, even if it is too dangerous to use all the time?
** Then there was the subcutaneous transponder, which gave the ship the ability to lock onto and beam up the landing party if they were out of contact. Its actual purpose in the plot was to give Kirk and Spock a Cool Escape, rather than pull the whole trick-the-one-inept-guard bit again. Despite the number of times they were separated from their communicators, the thing was never seen before or since. You'd think it would be standard issue.
** The [[Forgotten Phlebotinum]] was once ''the shuttlecrafts.'' The B story in "The Enemy Within" was a landing party trapped on a planet whose nighttime temperatures are Antarctica-ain't-got-nothing-on-it cold. The idea of sending down a shuttle ''never comes up.'' (Although, to be fair, the shuttlecraft hadn't been introduced yet.) The crew don't even bother to use the transporter to send the away team any survival gear, either.
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** The original series did this many other times with Scalosian water ("Wink of an Eye"), spores that can regenerate lost body parts, restore the human body to perfect health and give immunity to radiation ("This Side of Paradise") and Warp 11+ speed without strain ("By Any Other Name").
** The movies introduce the Genesis device (a form of instant terraforming that may bring people back to life as a side effect), which is so much further advanced than anything the Federation possesses before or since that it might as well be magic. The planet it creates disintegrates within a couple weeks, but surely there would be a way to work the kinks out within the next century, and the research that went into it could at least be applied to other projects. But in ''The Next Generation'' and ''Deep Space Nine'' terraforming is a long and arduous process that yields modest results. Not to mention it would have made a handy-dandy anti-Borg weapon.
** A major problem with ''[[Star Trek: theThe Animated Series (Animation)|Star Trek the Animated Series]]'' being considered canon is that the enormously useful life support belts never appear in any later Trek works. The belt surrounded the wearer with a glowing forcefield within which breathable air was provided. The real reason, of course, was that it was cheaper to animate a glowing outline than it was to draw spacesuits on everyone.
*** This was justified in the FASA RPG by having them very vulnerable to damage - one good hit could deactivate them leading to "messy" results.
* ''[[Star Trek: theThe Next Generation (TV)|Star Trek the Next Generation]]'' also indulged in this far too often. One example is the "dimensional transporter", that could transport things straight through even a Galaxy-class starship's shields (or any other shields) without trouble, but had a cumulative and lethal side effect on people who used it repeatedly. And while that's obviously a sane reason not to use it in normal service, it does ''nothing'' to explain why they didn't use it for, oh, one-way trips by inanimate objects straight through enemy starship shields... objects like armed anti-matter warheads, for example. (Or as a Plan B for when crew members are in danger on the planet but can't be beamed up due to an attack on the ship that requires them to keep their shields up or a [[Negative Space Wedgie]] that blocks the beam.)
** Or the episode "Lonely Among Us" where the transporter ''brought the dead back to life!'' Although it's possible that this was only feasible in that one case, since the person's consciousness had been converted into energy by the being that had possessed him. Still, the episode seems to imply that they can always rematerialize a previously saved version of a crewmember.
** The Galaxy class has Saucer Separation capability because the Saucer section contains the civilians, laboratories, families, etc., while the lower section contains the warp drive. It allows the civilians to be moved out of harm's way if the ship has to go into a firefight. Saucer separation was used often in the first season of the show, but after that it was forgotten and only sometimes referred to, just to drop the idea afterwards.
* ''[[Star Trek: Deep Space Nine (TV)|Star Trek Deep Space Nine]]'' came up with a holographic communications array, installed it on the ''Defiant'''s bridge and Sisko's office, used it all of three times and forgot all about it. Other than looking cool and saving some money on blue-screen usage, it really served no purpose at all.
** They also had an easily replicable gun capable of shooting through walls (a combination of x-ray goggles and micro-transporter). Like [[SF Debris]] mentions, that weapon could have been useful on many occasions.
* In ''[[Star Trek: Voyager (TV)|Star Trek Voyager]]'', the crew conveniently forgot several gadgets that could have gotten them home, or at least closer to it:
** Q Jr, depowered, retains enough Q knowledge to use the Delta Flyer's [insert [[Techno Babble]] here] to create portals, without any unpleasant [[Star Trek Shake]]-inducing side-effects that we saw. The crew could have done whatever it was that they did and gotten home via a series of portals, or at least - as was often the case with ''Voyager'''s non-deadly shortcuts - shaved a decade or two off their trip before the [[Applied Phlebotinum]] gave out.
** Borg warp coils, in a season-five episode, allowed the crew to jump hundreds of thousands of light years, cutting several years off the journey. For the rest of the series, however, the crew never bother to get any of these warp coils, despite coming across several opportunities to obtain some (most notably in an episode where the crew come across an entire graveyard of half-destroyed Borg ships).
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** Throughout the series, Voyager uses several technologies (the aforementioned Borg warp coils, the quantum slipstream drive from "Timeless", Kes' gift to Voyager in "The Gift", wormholes and other assorted devices) to cut a collective ''30-50 years'' off their journey. As the (non-altered) future of the series finale "Endgame" shows, after the crew ignored the Borg temporal node, they supposedly spent the next '''26 years''' merrily skipping along on their way to Earth ''without'' the aid of any of the aforementioned technologies. It's like the crew just gave up and decided to go the traditional way, even though Janeway wouldn't have hesitated to use an advantage if one presented itself.
** The complaint about the Nemesis movie applies to several Voyager episodes as well-- the show gives a reason ship-board transporters won't work, but they neglect to explain why they can't use the shuttle's independently-powered transporters.
* ''[[Buffy the Vampire Slayer (TV)|Buffy the Vampire Slayer]]'': One episode had the minion of the First Evil falsely claim he had kidnapped a proto-Slayer. Nobody thought of using the "detect proto-Slayer" spell discovered a few episodes before.
** The issue of the Adjoining Spell from the end of Season Four. Arguably the most powerful spell seen in the entire series, although with the drawback of {{spoiler|causing the spirit of the First Slayer to try to kill everyone involved in their dreams}}. It is never mentioned again.
** At the end of Season 5, Buffy uses a hammer that ([[Hand Wave|somehow]]) allows her to ''pulverise'' Glorificus, a literal [[Physical God]] that had [[No Sell|shrugged off absolutely everything that was thrown at her before]]. Said hammer is never seen or mentioned again, despite how useful it would have been against, say, the Turok-Han or Caleb.
* ''[[Stargate SG-1 (TV)|Stargate SG-1]]'' usually avoids this, with plenty of [[Chekhov's Boomerang|Chekhovs Boomerangs]] shown ''years'' apart, but it still has its examples.
** Kull Warrior Armor. That stuff shrugs off ''claymore'' explosions, and is light enough to wear, yet while [[Classy Cat Burglar|Vala]] is able to get her hands on a suit and capture a ''starship'' -- a ''United States'' starship, no less, so you'd think they learn -- with it, the US military doesn't even seem ''interested'' in it. Plus it looks ''really'' [[Badass]].
** Season 3, "Past and Present": They discover a drug that reverses the effects of aging. Next episode, it's forgotten.
** Atlantis is on Earth. Atlantis. The Ancient city-ship with sensors that are capable of picking up even cloaked ships in practically one third of the galaxy away from wherever it happens to be. The database of which contains truly obscene amounts of information on Ancient technology. And yet not only do they barely touch on the database in ''[[Stargate Universe (TV)|Stargate Universe]]'' (no sending a scientist back to, say, research useful ways to get help), but the {{spoiler|Lucian Alliance can somehow sneak past it}}. [[Word of God]] is that Atlantis had a fail-safe that required it be returned to the Pegasus Galaxy a few weeks later (this was to have been the plot of the ''[[Stargate Atlantis (TV)|Stargate Atlantis]]'' movie had it been greenlit), which addresses only some of these omissions.
* In ''[[Farscape (TV)|Farscape]]'', Zhaan is capable of camouflaging herself like a chameleon, but only uses this ability in one episode ("Bone to be Wild", Season 1). She is a plant and this ''is'' one of the few times she is in a forest, but one would think it would be ''harder'' for her to camouflage herself against something as complex as foliage, compared to the relatively uniform interior of ''Moya''.
** D'Argo's super-long tongue and anesthetic saliva gets forgotten every fifth episode or so. His arms and legs are bound, while a sole villain gloats nearby without a helmet, whatever shall he do? The funniest is when John asks him to knock him out in "A Prefect Murder", and D'Argo pistol whips him. And it doesn't work. John asks him to hit him again harder.
* ''[[Doctor Who]]'', both Classic and New Series, did this a ''lot''.
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* Ever since [[Disney]] took over the franchise, teams of ''[[Power Rangers]]'' have been getting [[Stock Super Powers|single special abilities]] while untransformed. Except in ''Ninja Storm'' and ''Jungle Fury'', where these powers were highly plot important, the Rangers would generally completely forget they had these powers for a dozen episodes at a time.
** In the original series, this happened far more frequently, with [[MacGuffin|MacGuffins]] being introduced regularly and never being mentioned again. The worst was the Sword of Power, summoned by a [[Brainwashed]] Tommy as part of a ploy by Lord Zedd to steal it. After regaining his mind, Tommy goes to great lengths to get it back, taking on the [[Monster of the Week]] single-handedly. He retrieves it... and it's never seen again. For that matter, it wasn't clear why it was so desirable in the first place.
* Claire's blood in ''[[Heroes (TV series)|Heroes]]''. It can heal people. It works on ''anything'', and nobody even ''mentions'' it in situations where it might be useful (for instance, on Nathan at the end of season 3).
** Claire's blood had previously restored her adoptive father to life. A shame he didn't mention this when her biological father needed it, and her grandmother was frantic to preserve him.
** Even stupider, her grandmother should have already known about it because of Adam.
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** This spell would have been ''very'' useful in the fight between Juliet and Mason to keep both characters from getting permanently transformed once Mason scratched Juliet.
** The improv spell, which does basically anything as long as you can make up a rythme for it.
* From the [[Television Without Pity]] [http://forums.televisionwithoutpity.com/index.php?s=&showtopic=3119365&view=findpost&p=10605523 forums]: "If a non-expert actress can figure out in a few days that she can make ''[[Angel (TV)|Angel]]'' vamp out into Angelus/pseudo-Angelus for a night by spiking his drink with an easily available drug, why didn't Wolfram & Hart ever consider the same method when they wanted to screw with Angel? Why didn't Wesley consider it (even simply to reject it) when they needed Angelus to fight The Beast?"
** In one episode, Wesley uses a flamethrower against a bunch of mooks. It is [[Awesome Yet Practical|awesome AND effective]], yet despite fire being deadly to most things, ''especially'' vampires, this is never seen again. It would have been particularly useful when Los Angeles was being swarmed with vampires and there were too many for them to attack one at a time.
* In ''[[Eureka]]'', the cryo sleep chamber that was used to put Fargo's grandfather in suspended animation could have been used many times to buy time during emergencies where people are mutating or dying of some horrible disease.
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== [[Video Games]] ==
* In ''[[Phoenix Wright: Ace Attorney]]'', when Phoenix first meets Maya and finds out she's a spirit medium, he comes up with the obvious idea - why not just summon the victim and ask them who did it? Maya replies that she's just in training and can't do that. In the next two games, not only is Maya more experienced, but Phoenix also meets an even more talented medium, Pearl, yet he never thinks of that idea again.
** This might be because {{spoiler|the one recorded time that was actually tried before, the answer the spirit gave turned out to be wrong}}.
** In addition, the time this * was* tried (albeit indirectly), {{spoiler|the summoning was used to frame Maya for a murder while the spirit was summoned}}
* ''[[Freelancer]]'', period. "Cloaking ships? What do you mean they were mounted on fighters during the Alliance/Coalition war centuries ago? They take more power than a battleship can provide! Besides, what war are you talking about? I've never heard of it before."
** They also forgot the fighter-sized warp drives. They used 'em about the same time as the fighter-sized cloaking devices. Those Libertonians really ought to pack some Phlebotinum next time they go somewhere.
* In ''[[The Elder Scrolls V Skyrim (Video Game)|The Elder Scrolls V Skyrim]]'' many guards tell you [[Memetic Mutation|"I used to be an adventurer like you, then I took an arrow in the Knee."]] but in a world of [[Heal Thyself|Magic healing spells]] and [[Healing Potion|instant health potions]] you would not think such a minor injury would be so debilitating.
* The [[Wave Motion Gun|Phase Transit Cannon]] from ''Wing Commander II'' is never mentioned again outside of a brief note in the manual for the ''Kilrathi Saga'' compilation mentioning that it was discontinued due to technical problems, and the [[Kill It Withwith Fire|flash-packs]] from ''Wing Commander IV'' isn't mentioned anywhere at all in later ''[[Wing Commander (Videovideo Gamegame)|Wing Commander]]'' games, as if the tech has vanished.
* ''[[World of Warcraft]]'' could be said to have this. When questing it is not uncommon to be given an incredibly powerful item to help with the quest, for example a crystal that can fire a beam to shrink down giants, making them much easier to fight, to never be used again.
 
 
== [[Web Original]] ==
* As pointed out in ''[[Yu-Gi-Oh!: The Abridged Series (Web Video)|Yu-Gi-Oh!: The Abridged Movie]]'', Kaiba never used the cards given to him by Pegasus ever again, even in episodes set later, and even though they are able to defeat the Egyptian God Cards. Nor does anyone in the series ever mention either the Pyramid of Light or the Blue-Eyes Shining Dragon. Ever. (Granted, the movie wasn't part of the original storyline, neither anime or manga.)
* In the first episode of ''[[Chad Vader]]'', he is shown to have the ability to force choke people, and he uses it on a guy who annoys him. In later episodes, his nemesis repeatedly humiliates him, and he just fumes impotently.
 
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== [[Web Comics]] ==
* A particular device in ''[[Special School]]'' is ''designed'' to make people (except certain psychics) to forget all about it.
* Early in ''[[The Order of the Stick (Webcomic)|The Order of the Stick]]'', when going to face Xykon for the first time, Durkon enchants Roy's sword with a disruptor spell, which would have destroyed Xykon completely with one shot if Roy managed to land a hit. That spell would probably have come in handy the next time Xykon showed up, but nobody even thought to mention it.
** Not to mention that the Giant, the author of said webcomic, specifically said that he prefers to do things that way. Taken directly from his FAQ, "Q: In Strip #X, why didn't character Y take action Z? If they had done so, they could have avoided a whole lot of trouble. A: You just answered your own question. The strip is ''about'' the trouble these characters get in; if a tactic would result in an effortless solution to their latest problem, there would be little point in showing it, see?"
* In ''[[Sluggy Freelance (Webcomic)|Sluggy Freelance]]'', an early [[Story Arc]] had Riff and Dr. Schlock work together to build a time machine. After the machine is destroyed by a potato chip (it was balloon based), neither of them ever tries building one again, despite [[Time Travel]] having more [[Deus Ex Machina]] potential than just about anything else.
** Though considering how much trouble they get into dealing with [[Alternate Dimensions]] and how big a mess they caused with the last time-travel jaunt, even [[Mad Scientist|Riff]] would hesitate to use it.
 
 
== [[Western Animation]] ==
* Events surrounding the second season finale of ''[[Avatar: The Last Airbender (Animation)|Avatar: The Last Airbender]]'' left many [http://mad-sniper.deviantart.com/art/Forget-Something-43181126 wondering] why Katara, who had theorized that her [[Chekhov's Gun|vial of water from the sacred oasis]] retained healing properties, didn't make so much as an attempt to whip it out and use on the mortally wounded [[Tragic Hero]] Jet a few episodes beforehand. [[Word of God|The DVD commentary]] has them admit that they forgot it, [[Author's Saving Throw|but said]] [[Holding Back the Phlebotinum|it wouldn't have worked anyway]].
** This is particularly jarring given how good this show normally is at avoiding this trope. Every time Aang can't use the [[Glowing Eyes of Doom|Avatar State]] or [[Elemental Powers|bending]] won't work, there's a perfectly logical explanation. It even gets Lampshaded a few times.
* This isn't always something big... It creeps in on a smaller scale, too, like Waspinator's [[Eye Beams]] that he shoots at Cheetor with in the ''[[Transformers]]: [[Beast Wars (Animation)|Beast Wars]]'' pilot. He never uses them again, even in the Season 2 opener, when Cheetor knocks his gun out of his hand and those [[Eye Beams]] would have been a nice alternative to running away. Of course, Waspinator's never really been the sharpest saw in the toolshed.
** He did actually use them at one other time, when he and Terrorsaur (who was also using [[Eye Beams]]) were trying to cut into Tigatron's stasis pod. Basically, if a character on the show had that ability and wasn't named Dinobot, they only got used on very rare occasions, and got overlooked numerous times that they could have been helpful.
** ''[[Transformers Generation 1]]'' had both sides constantly creating weapons that would be a [[Game Breaker]] in the hands of non-idiots. Instead of being used for what they [[Misapplied Phlebotinum|could be]], they'd be used to create/stop the problem of the day, and then never be seen or heard from again. Also, the many, many, '''many''' [[New Powers Asas the Plot Demands|one-shot powers displayed by individual Autobots]] that would never be used again. (Most iconically, the [[Pure Energy]] [[Epic Flail|flail]] and [[An Axe to Grind|axe]] used by Megs and Prime, respectively, in the series premiere only and never again.) They also suffered from [[No Plans, No Prototype, No Backup]]: If the ultimate weapon whipped up in the days since the previous episode gets smashed at the end, just making another is apparently never an option.
** It wasn't only ''Transformers'' that did this - in ''[[Super Dimension Fortress Macross]]'', we see that the [[Humongous Mecha]] piloted by humans have head-mounted cannons - that got used exactly four times during the ''entire show''. Only twice as a weapon - both of the other times they were used as ''cutting tools''.
* The Shard of Lightning in ''[[Xiaolin Showdown (Animation)|Xiaolin Showdown]]'' is an example of this. It can freeze time, and Jack used it to steal most of the monks' Shen Gong Wu, and cause various havoc. The monks won it by the end of the episode. They could have used it to freeze time and just kill Jack, Chase, Wuya and Hannibal all at once.
** Similarly, the Golden Tiger Claws, wich allow a person to create a portal to ''any'' location. It's introduced and done away with in Season 1, but returned to the heroes in Season 2. Despite the fact that Dojo can sense the location of any newly active Wu, the heroes never decide to have Dojo use the Claws to warp there, instead of flying there slowly enough to let the villains reach the Wu.
** Added to that, the Reversing Mirror, which is restored at the end of the episode "Citadel of Doom," could easily be used to restore Wuya to her full powers and body throughout all of season 2, yet she is content to simply look for all of the other Shen Gong Wu.
** The supreme example of this in ''[[Xiaolin Showdown (Animation)|Xiaolin Showdown]]'' is the Emperor Scorpion, a Shen Gong Wu that can control ''any'' other Shen Gong Wu. After being used to {{spoiler|defeat four Mala Mala Jongs (giant demons made of Shen Gong Wu) at once}}, it is sealed away in the vault. Neither the monks, nor the villains (who raid the vault every six episodes or so) ever take or use this supreme Shen Gong Wu ever again, presumably because it would make the show very boring.
* In one episode of the ''[[Dungeons and Dragons (Animationanimation)|Dungeons and Dragons]]'' cartoon, "Beauty and the Bogbeast", a magical river was introduced. At a particular time every year, it could take the heroes anywhere they wanted to go - Earth included. [[Failure Is the Only Option|Naturally, they are forced to turn around]], at literally the last minute, due to extenuating circumstances. They never seem to consider that there's nothing stopping them from coming back (it's not clear how long the series takes place over, but it can't be that much less) next year and making sure no one gets turned into a bogbeast this time. Of course, even considering the source, if there was ever an episode to throw on the [[Fanon Discontinuity]] pile ''anyway''...
* In ''[[Ben 10 (Animation)|Ben 10]]'', Ben's [[Evil Counterpart]] Kevin 11's original power was the ability to absorb energy, useful for shorting out/controlling machinery and creating instant lightning blasts. As a side effect, he was also able to use it to absorb alien superpowers via physical contact. After using his ability to steal Ben's 10 superpowers, however, Kevin seems to completely forget about his original ability, even though he names himself "Kevin 11" specifically because he has 1 more power than Ben. He fails to use energy control in situations it would have been ''extremely'' helpful (i.e. when being held captive by robots), and also fails to absorb any more alien superpowers despite apparently spending a few months roaming the galaxy doing nothing except beating random aliens up. The alternate future episode "Ken 10" shows how useful this would have been, as Future Kevin finally uses his power-stealing ability to become a formidable combination of [[Heroes (TV series)|Sylar]] and [[Inuyasha (Manga)|Naraku]].
** In the sequel, ''[[Ben 10: Alien Force (Animation)|Ben 10 Alien Force]]'', Kevin's powers are even more limited, as he can only absorb the properties of solid matter. This pretty much limits his options in combat into turning into something tough like metal or stone, then running around punching stuff. However, absorbing the properties of energy [[With Great Power Comes Great Insanity|makes him go insane]], which usually makes it a bad idea.
** Also in ''Alien Force'', the DNAliens are all [[The Virus|infected humans]], but Ben finds out the Omnitrix is capable of curing the people and is able to help Gwen's brother this way. He then proceeds to forget that he can do this until the [[Season Finale]].
** Incredibly, ''[[Ben 10: Ultimate Alien (Animation)|Ultimate Alien]]'' appears to have forgotten about the Ultimate forms, which ''give the new show its title'' in one of its first episodes.
* ''[[Fairly Oddparents]]''. Sometimes Timmy Turner wishes for superpowers. Sometimes he doesn't unwish them. These actually show up later and affect the plot. Same with magical items, handwaved by saying that they were neglected or that Cosmo was screwing with them.
* ''[[Space Ghost Coast to Coast]]''. The episode "Snatch" has a segment that is pseudo-satirical of this trope. Although the device in that case is a mind erasing device, so at least it is feasible that the device is never remembered.
* An episode of ''[[Winx Club (Animation)|Winx Club]]'' has a double dip of this: A segment of a season 3 episode opens with Icy boasting about a new fire power Valtor gave her. In the Trix's battles against the Winx, including the one just a few minutes later, she doesn't use it (and in fact, it's ''Darcy'' who sets a library on fire in a later episode, not Icy). And during the battle in the same episode, Layla sneaks up behind Darcy and Stormy to tie them up, even though way back in the second ever episode, she sensed Bloom's presence behind a garbage can, even though Bloom was well out of her view. (It should be noted, however, that the non-4K version does mitigate the stupidity in both cases somewhat.)
** A season 1 episode saw Icy destroy Red Fountain by freezing it with a nifty ice dragon. Season finale, Icy doesn't even make any effort to use it to freeze Alfea, or to take on Bloom, who has an fire-energy dragon of her own.
** Bloom was shown to be able to use her powers to revive the dead. It's not explained why {{spoiler|Nabu}} is still dead. This was changed to breaking a sleeping spell in the 4kids version, which removes the contention entirely.
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** In the 21st episode of the third season, Nabu claimed that the reason he had stowed away on the Specialists ship was so he could practice his invisibility spells against monsters living in the area the Winx were travelling to. Nabu's ability to turn invisible hasn't been seen again since this episode. (Although it's possible that he used this ability off-screen during season 4's episode 20 when he went to the nature fairy Diana's castle to try to save the Specialists, but this is just a theory...)
* Lampshaded/Parodied in ''[[Stroker and Hoop]]'' with Hoop learning ninja skills for plot-related reasons in one episode, but never using them again. It's then brought up in another episode. Turns out you have to actually continue practicing to maintain ninja skills. Who knew?
* In ''[[Futurama (Animation)|Futurama]]'', Richard Nixon's head uses a robot body in one episode, and Beck's head controls a small set of robot arms in another. If heads in jars can control robot bodies, why don't most of them do it?
** Heck, the day Nixon was elected, he got himself a gargantuan robot body complete with integrated rocket launchers. Where did it go?
* ''[[Star Wars: theThe Clone Wars]]''. Cad Bane steals a Jedi holocron. Anakin steals it back, but an explosion causes him to drop it. It lands between him and Bane? Hmm, should I use the Force to summon it to my hand, far to fast for Bane to react to, as I have done with my lightsaber on countless occasions? Nah, he's a bounty hunter, he's [[Evil Is Cool|too cool to lose.]]
** It's funny in that in the same arc (or perhaps even the same episode) Bane threatens to throw Ahsoka out the airlock if Anakin doesnt open the Holocron. He does so, Bane gets what he wants and ''still'' tosses Ahsoka out the airlock. Anakin force-pushes the airlock's laser door switch, shutting it off and saving his padawon. Wait, why didnt he just do it before? especially since Cad Bane ''didn't even move''.
** This is nowhere near the only situation where the Jedi forget about telekinesis. Ahsoka had an episode where someone stole her lightsaber and she engaged in a ''long'' chase to try and get it back. Why didn't she just summon it? She used telekinesis ''twice'' in the very same episode for different purposes and had dozens of situations where she could've just taken it. There were episodes where grenades were used against the Jedi - a perfect moment to use telekinesis. This never happens. There was an episode where a [[Mad Scientist]] drops a vial of deadly virus to the ground - and Obi-wan(I think) ''lunges'' after it, desperately trying to catch it, instead of just summoning it to himself. That's just the tip of the iceberg. The number of situations where the Jedi don't use telekinesis in this show is my biggest [[Star Wars: theThe Clone Wars (Animation)/Headscratchers|headscratchers]] about it. And yes, it does seem like every bounty hunter has a mysterious aura that makes Jedi into idiots.
* ''Birdman'' can only recharge his solar powers in sunlight. In the episode 20 "The Wings of Fear" he develops "Solar Energy Storage Bands", which provide him with solar energy to replenish his powers when he's out of the sunlight. After this episode they're never mentioned again, even though they would have been incredibly useful.
* ''Challenge of the [[Super FriendsSuperfriends]]'' is notorious for this trope. Lex Luthor [[Cut Lex Luthor a Check|invents]] teleporters, time machines, cloaking devices, a gizmo that sucks the [[Green Lantern Ring]] off its wearer's finger, etc., etc. ... uses them once ... and then then never uses them again, even in situations where one of them would save the Legion of Doom's bacon.
** One particularly damning example has Luthor forget a piece of Phlebotinum only moments after acquiring it. When he time travels to alter several of the Super Friends' origins, Luthor switches places with Hal Jordan and becomes the recipient of Abin Sur's [[Green Lantern]] ring. He dons his own Green Lantern suit and uses the ring to fly back to the Hall of Doom, and then promptly puts his purple jump suit back on and makes no other attempt to use the ring. This after having been defeated by Green Lantern's power too many times to count!
* A rare villain example in ''[[The Nightmare Before Christmas]]'': Oogie Boogie has the ability to <s> [[Avatar: The Last Airbender|Airbend]]</s> suck in everything like a gigantic vacuum, which is how he {{spoiler|recaptured Santa and Sally}}. He never thought to use this in his battle against Jack Skellington, though this is somewhat justified, as Oogie was trying to get ''away'' from Jack. [[Just Eat Gilligan|Still could have ate him, though.]]
* ''[[Star Trek: theThe Animated Series (Animation)|Star Trek the Animated Series]]''. The "life support belts" were clearly introduced to save on animation costs, but they're certainly a handy device. They never show up in the rest of ''Trek''.
* [[Teenage Mutant Ninja Turtles 2003 (Animation)|Teenage Mutant Ninja Turtles 2003]]: In the ''Fast Forward'' season, the Turtles and Splinter are stranded a hundred years in the future with no way of returning to their own time... not one mention is made of their time-traveling friend Renet, who is supposed to keep an eye on the time stream and would almost certainly have noticed if the Turtles were suddenly in a different time period than they were supposed to. Possibly justified if the Turtles and Splinter ''were'' supposed to spend some time in the future.
* Season 1 of ''[[My Little Pony: Friendship Is Magic (Animation)|My Little Pony Friendship Is Magic]]'' is full of this. The Elements of Harmony ([[What Happened to Thethe Mouse?|and Princess Luna]]) are completely forgotten about after the second episode, Twilight Sparkle never teleported after episode four, Pinkie's "Pinkie Sense" is never mentioned again, and while the Sonic Rainboom pops up later it is only in a series of flashbacks. Fortunately, season two turned ''all'' of these and more into [[Chekhov's Boomerang|Chekhovs Boomerangs]].
 
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