The Collector

One of the characters runs afoul of The Collector of the Strange, who decides to add them to his collection. Usually this is seen in Speculative Fiction: the collector is an alien, often of the sufficiently advanced variety, and the collection is only revealed at the end in a Twist Ending. But he could just as easily be a slaver or an obsessed lunatic in a present or past setting. He's prone to saying "It Must Be Mine" and "If I Can't Have You, no one can!"

Where the horror of being added to a collection is not the point of a Twist Ending, then the remaining cast members mobilize to rescue the kidnapped individual -- and usually free all the other "specimens" in the collection in the process.

A variation sometimes seen in children's shows has the collector stealing the character's unusual/unique pet. Vulnerable to Interrogation By Vandalism. If they have somewhat altruistic motives, their "collection" will be a comfortable Fantastic Nature Reserve. Of course, it may just be a Gilded Cage... Compare Living Doll Collector.

Not to be confused with the bizarre as hell gorn movie released in 2009, or the 2004-2006 Canadian TV series, or the 1963 Stalker With a Crush novel by John Fowles or the film based on it starring Terence Stamp.

Anime and Manga

 * Maburaho has a collector as a full-time character after her introduction. Her stated goal is to make a certain ghost a part of her collection.
 * Yu-Gi-Oh GX has a minor character named Giese Hunt, a self-stylized Duel Spirit hunter after Johan's prized (and - until Episode 130, nonexistent) Rainbow Dragon Duel Spirit to add to his collection of trophies, even capturing his Sapphire Pegasus Duel Spirit as bait. Not surprisingly, this fixation stemmed from a childhood trauma where he was the victim of Duel Spirit theft.
 * In Pokémon, Pikachu is kidnapped by a Pokemon Hunter named J. At the end of the episode, Pikachu escapes, but J is still on the loose.
 * A better example for this series would definitely be the second movie, where the villain targets the three legendary birds Articuno, Zapdos and Moltres in order to force the legendary Lugia out of hiding, so he could have them all in his collection. Of course, the real problem for the heroes wasn't just that he was merely collecting, it was that his attempt disturbed the balance between the three birds which lead to global weather chaos.
 * The movies soundtrack even gave us the offical collector villainsong "Ware wa collector" (I am a collector).
 * They exist in the games too.
 * Given that the Pokemon themselves are sentient beings who are gathered up in as high number as possible, the main characters of the series could all be seen as versions of The Collector, albeit much more benevolent and loving ones. Unless they're evil.
 * Not just the main characters; wouldn't every Pokemon trainer ever fit into this, in some way?
 * Not really, only the player characters and maybe a few of the richer or luckier trainers have pokedexes, most of the population doesn't really have a motivation for collecting other than for entertainment or for more malevolent things.
 * Noah in the Soul Eater manga (See Above) collects things he find interesting by sucking them into a Tome of Eldritch Lore.
 * More than one Shinma from Vampire Princess Miyu capture and collect people.

Comic Books

 * The Marvel Universe has an Elder of the Universe known as The Collector, whose mania for collecting is so strong it makes him immortal.
 * Kate ran into one of these in Hellboy while trying to find an alchemical guide that would let them rebuild Roger the Homunculus. He would only give it to them if Abe became his prisoner. Kate ended up freeing the demon The Collector had enslaved and it killed him.
 * One issue of Archie's Sonic the Hedgehog comic had the main cast kidnapped by Car-Heem, an alien collector from the planet Weet ("Car-Heem of Weet"...get it?).
 * Larfleez, the ONLY Orange Lantern in Green Lantern comics has this as his defining character trait. He's powered by greed itself and will not be sated until every single treasure in existence is his.
 * Alyosha Kravinoff had a zoo of characters with Animal Motifs such as Dragon Man, Man-Bull, Mandrill, Rhino, Swarm, Tiger Shark, and Vulture.
 * [[http://en.wikipedia.org/wiki/Auctioneer_
 * Tom Strong was once captured and imprisoned in a comic book with other "science-heroes" by Horatio Hogg, Collector of Champions.
 * In Sillage #2, Enshu Atsukau wants to add Nävis to his "collection".

Film

 * The second Toy Story movie is about Woody getting "kidnapped" by a collector who wants to sell him to a museum in Japan. Woody is actually a toy, though.
 * Buzz Lightyear of Star Command, "A Zoo Out There" features the Chlorms, who regard every other species as "lesser beings", kidnapping members of the Galactic Senate (and eventually Team Lightyear) to put in their zoo.
 * Done in the xxxHolic film, "A Midsummer Night's Dream" when Yuuko gets an invitation stating that her 'collection' is not complete. She brings Watanuki and Doumeki along with her into a mansion where there are several other collectors that collect rare things. It later turns out that the person that invited them there
 * In Pirates of the Caribbean: On Stranger Tides, Blackbeard shrinks the ships of defeated crews, seals them in bottles, and stores his collection of them in a cupboard. He has several dozen.
 * In The Collector, a 2009 saw-esque movie by the writers of Saw 4, 5, 6, and 7.

Literature

 * The likely Trope Namer is John Fowles' 1963 novel The Collector, which features a psychologically unstable butterfly collector 'collecting' a young woman he has seen around town, and keeping her in his cellar. It was also adapted into a film.
 * It's more of a Stalker With a Crush kind of situation.
 * The Trafalmadorians in Slaughterhouse-Five kidnap the main character, take him to their planet, and display him in a zoo. Lessons about free will and predestination are learned.
 * The title character in Roald Dahl's short story The Landlady is implied to be a homicidal one of these.
 * In the first Percy Jackson and The Olympians book, the heroes visit Medusa's garden-statue store. Guess how she makes the statues.
 * In the Nightside novels by Simon R Green there is a character who is called "The Collector." He has unique items from the past, the future, and alternate time-lines. He is also fairly paranoid about other collectors stealing from his collection. He once went so far as to store his collection on the Moon. Didn't stop John Taylor from accessing it, though.

Live Action TV

 * Doctor Who has a variation on this in "The Space Museum".
 * It also turns up in the Expanded Universe novel "The Last Dodo".
 * An example from the new series turns turns up in the Ninth Doctor episode Dalek, where the eponymous Dalek is the prize specimen in Henry van Statten's museum of alien artefacts. Upon realizing what the Doctor is, van Statten tries to collect him too.
 * The Twilight Zone had a newlywed couple wake up in a small, deserted town, only to find out at the end that they were toys in a giant alien's playset.
 * Star Trek the Next Generation, "The Most Toys": Data is kidnapped by Kivas Fajo to add to his collection of unique objects. At the time, everyone (including Data) thought that Lore, the only other sentient android in the known world, was dead.
 * Farscape: Zhaan is captured by a plant collector.
 * Criminal Minds Fisher King two-episode story uses the trope-naming book as an important story key. the UnSub is almost like the psychotic protagonist of the book.
 * The show makes use of the "collector" subtype of serial killer later on in "The Uncanny Valley," with a damaged woman who puts other women in a state of chemically-induced paralysis and makes them up as dolls.

Tabletop Games

 * The vampire Luthor Harkon in warhammer fantasy battles collects dead sailors (as zombie pirates in his fleet) and Mayincatec artefacts in a hope to get his magical powers back and is also utterly insane.
 * In the Dungeons & Dragons mythos, some Beholders collect statues of interesting-looking characters to decorate their lairs.
 * Trazyn the Infinite, a Necron Overlord in Warhammer 40,000, has this as his particular quirk, and has a whole planet dedicated to his obsession. Artefacts of note include the preserved head of Sebastian Thor (Which then begs the question what happened to the body), the husk of an Enslaver, and a giant man clad in barqoue power armour whose face is locked forever in a tormented scream. It's partially for his own amusement, and mostly because he wants to save important pieces of history.

Video Games

 * Admiral ZEX, in Star Control II.
 * The main antagonist from Little Big Planet, appropriately named The Collector, goes around the various levels kidnapping major characters in the background.
 * The entire plot of Mass Effect 2 revolves around fighting an enemy known as the "Collectors," who are named for their tendency to "collect" samples of unusual and unique biological specimens for genetic experiments. They are abducting human colonies, are actually working with the true villains of the series, the Reapers, and are . In the end
 * Conroy Bumpus in Sam and Max Hit The Road does a Villain Song about being one of these.

Western Animation

 * Mucha Lucha, "The Collector" features an alien trying to collect masked wrestlers.
 * In the Superman animated series, the two-parter "The Main Man" featured both Superman, the last surviving Kryptonian, and Lobo, the last surviving Czarnian, being captured by an alien called The Preserver.
 * And you have to include Brainiac, who ensures that his collected data is one of a kind by destroying the planet he got it from.
 * In 2007, an alien villain named The Auctioneer captured Supes and several dozen other heroes. Guess what he planned to do with them?
 * Parodied in a Halloween episode of The Simpsons, wherein the Comic Book Guy kidnaps his favorite celebrities, including Tom Baker, Matt Groening, and Lucy Lawless, and encases them in mylar bags.
 * Spoofed in the Futurama episode "Where No Fan Has Gone Before," where a Sufficiently Advanced Alien is the galaxy's biggest Star Trek fan (actually second biggest, after Fry), and kidnaps the cast of the show.
 * Powerpuff Girls, the episode "Collect Her" finds our titular heroines being captured by Lenny Baxter, a comic book geek who has collected every piece of Powerpuff Girls merchandise in existence and, desperate for more, has decided to add the Girls themselves to his collection. He is defeated when some children remove his toys from their original packaging.
 * In the Chip 'n Dale Rescue Rangers episode "Three Men And A Booby" -- stop that snickering, unless it's because of the Three Men And A Baby reference -- an obsessed egg collector collects a booby egg. The mother booby enlists the Rangers' help in reuniting the egg with her.
 * D.N. Amy from Kim Possible eventually makes Rufus and Steve Barkin into one giant living cuddlebuddie for her collection.
 * One villain from Bonkers, a toon that collected other toons, was actually called "The Collector". . It was incredibly creepy.
 * In the Sushi Pack episode "Collect 'Em All," The Collector captures the Sushi Pack to add to his collection, but gives them one chance to win their freedom in a remote controlled car race.
 * Danny Phantom had a Villain of the Week, Skulker, who collected various kinds of ghosts, and wanted a half-ghost for his collection.
 * Big Mitch, the Evil Poacher from Phineas and Ferb.