You Shall Not Pass/Western Animation

"Optimus Primal: You can't stop that thing alone! Tigerhawk: Perhaps... but it is my destiny to try. I will hold the line here. Go!"
 * Tigerhawk's sacrifice to slow down the warship Nemesis in the Grand Finale of Transformers: Beast Wars.

"Cheetor: Three or 300, you're not getting in."
 * Then again in the Grand Finale of Beast Machines. All of the other Maximals have been defeated, leaving only Cheetor (who is surrounded by destroyed Veichons) preventing the Veichon Generals from entering the ship. Subverted in that they all just open fire on him, forcing him back into the ship.

"Monty Uno (Numbuh 0): I am not moving from this spot!"
 * Codename: Kids Next Door: Monty Uno, the legendary numbah zero with a restored memory, faces his father, a meglomaniacal super evil who wants the world to be like the good old days and almost completely has done so, and holds him from reaching the last shred of the world he hasn't turned Victorian, his brother's mansion.

"Wolverine: Next time I try ta save yer life, have sense enough ta let me do it. Gambit: What make you t'ink dere gon' be another time?"
 * In the mid-1990s X-Men animated series, in the first season finale, Wolverine and Gambit are infiltrating a Sentinel production facility. Wolverine smells some, and so he herds Gambit to relative safety--then locks the door behind him and runs back to face them. Subverted in that Gambit blows the door open and comes to Logan's rescue. Near the end of the episode, Cyclops finds the two of them standing on a pile of destroyed Sentinels, Wolverine's shirt in tatters.

"Optimus Prime: Megatron must be stopped... no matter the cost."
 * Sort of inverted in the 1986 Transformers: The Movie, where Optimus Prime, as opposed to facing down a horde of enemies, charges them single-handedly to get to his target.

"Jimmy: You shall not p-puh... You shall not puh-puh-p-p... You shall not puh-pah-paaa-- (a dozen sixth-graders run him over) Jimmy: ... Pass."
 * In Star Wars: Clone Wars, Shaak Ti stays behind to fight off thirty-something Magnaguards, to give the other Jedi and the Chancellor time to escape. It's then subverted when the robots stop fighting and leave, and Shaak Ti realizes too late that they were a diversion.
 * Happens every episode in the first season of Code Lyoko, as the usual plot involves the gang evenly matching (or being overwhelmed by) XANA's programs while Aelita gets to the Reset Button.
 * Parodied on Chowder, when Mung and Shnitzel are guarding the fridge to keep Chowder from sleep-eating the entire kitchen. Mung even yells out "YOU SHALL NOT PASS!" before Chowder (now a hairy, hulking thing) chews the two of them up and spits them out.
 * In the Dr. Seuss short Halloween Is Grinch Night, main character Ukariah tries to stop the Grinch from tormenting Whoville with his strange device, the Paraphernalia Wagon. Although the Grinch regards him as not a threat, he eventually decides to test the abilities of the Wagon on Ukariah. He survives, miraculously.
 * Parodied in "The Return of the Fellowship of the Ring to the Two Towers" episode of South Park; Jimmy, who has a speech impediment, stays behind to hold back a horde of bicycle-riding Sixth Graders, but due to his stammer, he can't quite get the line out;

"Vector Prime: Hold, Megatron! You shall go no further! (dark clouds temporarily fill the sky overhead; a swirl forms, and from it descends a streak of green light; the light enters the socket located below and in front of Vector Prime's chest orb, and becomes his Cyber Key)
 * And parodied within a parody on Family Guy: in the "Petergeist" episode, Herbert the pedophiliac neighbor defends Chris from the carnivorous tree, "Hey skinny-britches! That there's my man! Why don'tcha pick on someone your own size!" He then declares, "YOU SHALL NOT PASS!" striking the earth with his walker and splitting open the ground beneath the tree - and himself. They plummet together toward the bottom of the chasm with Herbert battling the tree with his walker the entire way down.
 * For a third Transformers example, in Transformers Cybertron's second episode, Vector Prime does one of these to keep Megatron from discovering the location of the Autobots' base. He does it without dying.

Vector Prime: CYBER KEY POWER!

Optimus Prime: By the Allspark of Cybertron!

Megatron: What is it?! What are you protecting?!

Vector Prime: Tachyon shield!"

"Kilowog: ''It may only be a matter of time but I'm not gonna make it easy for you poozers!""
 * Megatron collides with the shield, and is stopped cold. Soon enough, he recovers slightly and begins trying to break through. Vector Prime responds with a laser blast from his chest orb. Optimus follows up by transforming to Super Mode and blasting Megatron as well. Megatron's shoulder badly damaged, he and Starscream retreat.
 * Dug in the fantastic Disney/Pixar movie Up attempts one of these when Carl and Russel are . Dug being who he is though, his plan consists of planting himself in front of the oncoming horde and saying in a stern voice, . It doesn't work.
 * Parodied in the new Comedy Central series Ugly Americans with . You're free to pass, if you sign in first.
 * Avatar: The Last Airbender did this several times.
 * Iroh broke out of his restraints and fought off in the second season finale.
 * Mai and Ty Lee to allow  to escape The Boiling Rock.
 * Jonny Quest TOS episode "The Dragons of Ashida": Race Bannon volunteers to stay behind and distract the title dragons (sort of like huge monitor lizards) so the Quests could escape. He managed to take out both dragons through clever actions and escaped.
 * In Scooby Doo: Abracadabra Doo, Shaggy says this to the griffin.
 * In the ThunderCats (2011) episode "Omens Part Two", during The Siege of their Doomed Hometown, a wounded Jaga, announcing that "I Will Only Slow You Down", buys time for Lion-O, Tygra, Cheetara and Snarf to escape Mumm-Ra's invading forces.
 * The Teen Titans try this in the season 4 finale against Slade and his army of fire demons. Cyborg even shouts "No one's getting in here!" Unfortunately, against an immortal foe with an infinite supply of reinforcements, their defeat was pretty much inevitable.
 * In Transformers Prime, Ratchet, Bumblebee and Bulkhead pull this on Megatron to prevent him from
 * In American Dad, Debbie and her Goth clique does this for Steve as he and his friends flee from the other school cliques (in a random homage to The Warriors). Their strategy is to block the enemy's progress through dancing to Joy Division. It works.
 * The situation is grime in Green Lantern: The Animated Series. The Big Bad is on his way to massacre the Guardians with his armanada about to enter Guardian-Controlled space. Hal and Razer race to stop him while Kilowog stays behind to hold back the armada.