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- Bokurano: If you lose the game, your universe goes bye-bye. If you win, someone else's goes bye-bye. Provided the tournament has a standard ladder form, 2^15 - 1 universes — 32,767 whole universes, lifeforms included — are destroyed during the anime's tenure. But hey, it may all be for a good reason... Or not.
- The standard effects of a Lost Logia reaching full power and going out of control in Magical Girl Lyrical Nanoha are multi-dimensional catastrophes that destroy many worlds in the process.
- In Noein, the goal of the title Big Bad is to destroy all possible parallel universes so that only Shangri'La remains.
- Attempted by Apocalymon in Digimon Adventure
- This is the goal for the Shadow Dragons in Dragon Ball GT
- This is the main threat in The Noozles, a preschool-friendly show in which partway through you find out that human activity has damaged the bond between our universe and a universe of cute koala Nazis; this has resulted in the two universes separating off-balance and quickly, and unless something is done the two universes will rip each other apart.
- Crisis on Infinite Earths destroyed almost the entire multiverse and squished the surviving few universes into a messy amalgam universe. Prior to this, the Anti-Monitor destroyed, ultimately, infinity minus five universes.
- In JLA/Avengers there was Krona, a being that attempted the destruction of the core universes of both DC and Marvel, in order to remake the new universe that would emerge in his own image.
- In the Marvel Comics, Unicron from Transformers has this as part of his background. He ate most of the previous universe and went to sleep, only to have the scraps he left behind form a new universe while he slept. Now he wants to make sure it doesn't happen again.
- The plot of Jonathan Hickman's Avengers is the discovery of a chain-reaction of colliding universes, each one causing the multiverse to contract just a bit more until "everything dies." There are ways to slow the process down, but they are... costly. This ultimately leads in Secret Wars (2015) with all universes destroyed, only bits of them surviving to become Battleworld.
- In The Sandman Overture, Glory of the First Circle explains to Morpheus that a star has gone mad and become a cancer in the universe. "From across the vastness of the cosmos, impelled by whatever senses drive them, singular creatures are gathering to feast on the coming massacre and the madness. And the madness will spread. The galaxies themselves will shake and vanish. The other realms in their turn with fade and be destroyed. Soon enough, the mind that is the universe will cease to think, and all things will cease to be."
- In Uncanny X-Men #108, the Uncanny X-Men are recruited by forces from the Shi'ar Star Empire to heal the M'Kraan Crystal before all of reality fractures and collapses. It is eventually restored by Jean Grey, who becomes the awesome and terrible Phoenix in the process, and the universes are saved. But in "Gambit and the X-Ternals", part of the Alternate Universe "Age of Apocalypse", Gambit is told that, since Jean Grey never healed the crystal in the new timeline, all of reality is about to unravel at the seams unless the original timeline is restored.
- In Riddle of the Seven Realms by Lyndon Hardy, an ancient demon plots to destroy all known worlds by lighting a fire in his home dimension, which will punch a hole into the void and suck in not only the demon realm, but also all other worlds that connect to it via flames. (Presumably, any undiscovered universes that lack the "flame permeates all" rule of wizardry would escape this fate, making it this level and not Class Z.)
- The arrival of the Elder Gods in New York in Joe Golem And The Drowning City would annihilate not only our entire universe, but according to Simon Church, probably many others, including Heaven, Hell and other afterlives.
- The Dark Tower: This is what happens if the Tower falls: the utter reversion of every single universe, dimension, plane, time, space etc etc. to the chaos from whence they came. The Big Bad want to this because he claims he will be able to rule that chaos forever afterwards. The worrying part is that this is starting to happen already at the beginning of the series. Even more scary is that protagonist has to succeed every single time. The antagonist just has to win once. However it seems that each time it resets, the Gunslinger gets something that might make this cycle the last one where he has to win.
- In the 2010 finale of Doctor Who, after the Silence detonates the TARDIS, all that remains of every reality is that of Earth in this universe, just a stone's throw from Class Z. Stars are myths (and our sun is actually the TARDIS burning), all that's left of the Daleks is one shadow in time, and as the characters edge closer to the date of the TARDIS' explosion, people start vanishing from time. This is reset by the Doctor creating a second Big Bang with the Pandorica.
- At the end of VVVVVV, you have to destabilize the dimension to get back to your own. However, this has destabilized two dimensions so after the ending you have to find a way to fix them.
- If your team is defeated in Marvel vs. Capcom 3, this is the fate that Galactus has in mind for the Marvel and Capcom universes.
- Despite Umineko: When They Cry being mostly a romance-mystery novel, in the final battle between Lambdadelta and Bernkastel , both rapid-fire attacks that shatter entire fragments using the force of Big Bangs and Big Crunches. Each fragement is an entire parallel universe. On a (comparitively) lesser scale, Willard cuts an entire fragement in half with a single sword slice.
- While we never learn the full extent of the damage past "rampaging through timelines", it's implied that Add from Elsword started causing these in his Diabolic Esper path.
- The penultimate goal of Airy and Ouroboros in Bravely Default. After Airy uses the crystals to physically link the universes, they'll consume the multiverse as fuel for their ultimate goal: breaking into and conquering the Celestial Realm, aka the real world.
- In Homestuck, Lord English has destroyed (or at least engineered the destruction of) countless universes, including the ones the protagonists are from, and is trying to destroy them all.
- It was revealed that when Universes A and B were destroyed by Spades Slick and Jack Noir, respectively, they actually destroyed every possible alternate version of those universes, so it was actually two entire multiverses being destroyed.
- In Melonpool, an excess of Time Travel going horribly wrong results in this.
- At the end of Spider-Man: The Animated Series, Spider-Carnage, an alternate universe Peter Parker who hit the Despair Event Horizon after his universe's version of The Clone Saga and was bonded with the Carnage Symbiote, attempts to destroy the multiverse, aching to a Class Z destruction (although it probably wouldn't count that far, since those sent to stop him are alternate Spider-Men, which probably means only the universes containing or related to Spider-Man would be destroyed).
- Similarly, in Turtles Forever Utrom Shredder destroys his native dimension and begins destroying another, eventually wiping out every universe that contains the Teenage Mutant Ninja Turtles.
- Nearly happens twice in Danny Phantom; first when the Guys in White try to destroy the Ghost Zone, and again in the finale when Earth is threatened by the "Disasteroid". These apocalypses would have been possible because the Ghost Zone and Earth are opposite dimensions and the destruction of one will destroy the other.
- The snake from the animated adaptation of The Little Prince has, as established in the setting, existed before the known universes. Being annoyed by the new presence his goal became to destroy all of the known universes there are, with only him still existing. Later on however he would fall in love with a rose that he would want to keep for himself. He would however still wipe out everything else.
- Futurama: In one What If? scenario, Fry destroys almost all reality, leaving himself, Stephen Hawking, Nichelle Nicols, and Gary Gygax to play Dungeons & Dragons for the rest of eternity.