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One possible ending to stories in which the hero or heroes are trapped in an Alternate Universe is to somehow force the universes to merge or collapse into one single time-line that exhibits (hopefully the best) features of both. A way to Save Both Worlds, if you will.
The current world is headed to nothing short of disaster, so the only choice is to put it back a different way.
For making a world from scratch, see World Building.
Anime & Manga
- Parallel Trouble Adventure Dual
- In the manga Mugen Densetsu Takamagahara: Dream Saga, awakening Amaterasu is meant to restore both worlds to their original, unpolluted glory. However, the ending offers the idea that Making a Better World isn't always better: the team learns that the original two worlds have to be destroyed and their populations killed. They resolve to Save Both Worlds instead of make new ones.
- The objective of the villain in Noein is to converge the infinite possible universes into one, which would be free from suffering.
- In 11eyes, Kakeru comes to the realization late in the game that every one of the chosen ones was drawn from another, slightly different, reality since memories and information don't match up. Everyone worries that they have to die because of Liselotte's soul in them and when the battle is finished, they won't be able to see each other again. Kukuri heals the world back to normal. Everyone ends up staying together in the same world, a composite of all of theirs. They'd become such a tight group of True Companions that it would be too cruel to split them apart.
- Used mildly in the Shara/Shura arc of Tsubasa Reservoir Chronicle. In this case, the main characters don't even realize they are time traveling, but their actions do result in friendlier interactions in the 'original' world. Not that there aren't consequences....
- Chao Lingshen from Mahou Sensei Negima tries to expose the magical population to the Muggles. When confronted and asked why, she claims it's for this trope.
- Inverted in Super Dimension Century Orguss. The protagonist's actions have caused a Merged Reality, it's wreaking havoc, and it becomes his and others' job to undo the damage and split all the realities and timelines back up.
- American Comic Book Example: the climaxes of Crisis on Infinite Earths, Infinite Crisis and Zero Hour. DC Comics seems to be in a habit of doing this every decade or so.
- Subverted like mad with The DCU character Super***-Prime (he used to be Superboy-Prime until DC lost the rights to the name Superboy, now he's Superman-Prime for no good reason). His motivation is that he wants to bring back his world, the "perfect" world... and he's willing to blow up every other world in existence to do it. Moreover, he has no problem killing anyone who gets in his way (or anyone who doesn't), because he judges them to be "stupid" versions of people who'd exist on his world. Yes, to some extent, he is a superpowered avatar of fanboy rage.
- Subverted over and over again in Marvel's Earth X trilogy. Mephisto is continually tempting people to change history for this purpose, when in fact it creates alternate universes--so even if the new universe is better, the old one is still there and just as terrible as before. Meanwhile the Elders of the Universe are trying to put all these alternate universes back together to recreate the original--and never mind that this involves the effective death of trillions of people native to the new universes.
- A Marvel Comics storyline had the Fantastic Four aiding their enemy-turned-ally Amazon Thundra to merge her Lady Land Alternate Future of "Femizonia" with the misogynistic world of Machus to form a composite future of (theoretical) equality between the sexes. The men and women still fight each other constantly with deadly weapons, but Reed Richards just Handwaves that as the Proud Warrior Race version of Slap Slap Kiss. Naturally, Thundra finds this world boring and seeks out an analogue of Old Femizonia to settle in.
- The DC and Marvel multiverses briefly merge together into the Amagalm universe in DC vs Marvel. Years later they are merged again(but not creating the Amalgam universe) in the JLA-Avengers crossover.
- The Back to The Future movies, the first had this happening on a small scale to the protagonist and his family.
- Subverted in the movie Idiocracy. The main character, after being a Human Popsicle for 500 years, wakes up to find the world has taken a drastic turn for the worse intelligence-wise. He proceeds to look for the time machine that must exist by now to tell the world what awaits them if they do not change. Due to the world being too stupid to have invented it, there is no time machine. He instead chooses to teach the world he's in now to improve.
- Caesar is all about this in Battle For The Planet Of The Apes, since he knows that his parents came from a world where the world was destroyed in an Earthshattering Kaboom. We never find out if he managed it or not, fans disagree.
- Piers Anthony's Apprentice Adept series eventually merges the two worlds into one; as the characters are explicitly paired across both worlds (mirror-universe twin kinda thing), each pair merges into one being, and each pair has to time-share their body. Substantially easier for the heroes than for the villains, since heroes are used to putting the needs of others on par with or ahead of their own.
- Inverted in Terry Goodkind's Sword of Truth series. In the final book, as a final solution to the gigantic evil empire, full of people who
refuse to see things his waywere trying to kill anyone and everyone who doesn't see it their way, protagonist Richard Rahl uses his new-found cosmic powers to create a new, separate world without magic, where he puts all the undesirable people. (Which is pretty much what they wanted all along.) This new world, with no magic and full of evil religious fanatics, is implied to be the origin of our world.
- Diana Wynne Jones' book Witch Week ends this way, with the merging character explaining to the cast that they will all melt quietly into the people they really are in the other world. (Since they're probably going to be burned as witches otherwise, this sounds quite appealing.)
- It should be noted: 'probably' in context means 'if the world isn't destroyed first,' which is what will happen if their world (which was not supposed to exist) isn't merged with the other one.
- Two different perspectives on this are given in The Pendragon Adventure series. Each Territory has a Turning Point where it can either fall into chaos or continue on peacefully. Bobby always aims for the second option, trying to win over Saint Dane. However, Saint Dane talks of "The Convergence", saying that he's also wanting to make Halla (the entirety of the Territories and the universe) a better place - but the chaos has to come before he can achieve his goal.
- At the end of The Pilgrims of Rayne, after losing to Saint Dane on Ibara, Bobby forcefully traps himself and Saint Dane on the island territory in an attempt to make it better. This might also count as a Ten-Minute Retirement.
- Done absolutely awesomely in Orson Scott Card's Pastwatch the Redemption of Christopher Columbus. The plot is rather complicated, but suffice it to say it emerges that our own timeline is the product of interference from another timeline, in which the Tlaxcalans of Central America conquered Europe and possibly the world. (The author does an excellent job of making it sound plausible). The people of that timeline viewed the Tlaxcalan invasion as the greatest catastrophe in human history, and so they altered their own timeline, by motivating Christopher Columbus to sail west (with a holographic God). Of course, in the story our own timeline appears to be headed for human extinction, so the characters make their own alteration, preventing both the Central American and European civilisations from wiping each other out. They are apparently more successful than the original alterers.
- This is because the protagonists have realized that the reason the original "interventionists" failed was because they made a single alteration and didn't see it through. Instead of sending a holo-recording, they decide to send three people with a plan for each. One's job is to destroy Columbus's ships and die in the process, preventing him from returning to Europe. Another, a native Mayan, has to unify the Central American peoples and teach them a milder version of Christianity. The third, an African female, has to teach Columbus the error of his ways and, along with him, unify and educate the peoples of the Caribbean islands in the same manner as her partner. The end result is that, when the ocean-going ships from the new American confederation arrive to Europe, they do so as equals. This prevents the world dominated by either the Europeans or the Native Americans. This still fails to explain the lack of an ecological catastrophe in this version of history.
- Averted in Animorphs. When the kids travel back in time to stop Visser 4 from messing with history, they consider using the Time Matrix to change history for the better. However, they hit the Reset Button by accident and put everything back the way it was (minus one host body for Visser 4).
- The twist resolution to Dragon's Ring. The protagonist had been openly working to destroy the world all along, but it turned out that wasn't the only way to save all the worlds.
Live Action Television
- Arguably the entire plot for the first season of Heroes, which deals with one person who can paint the future, several people with premonitions of it, and one person who can actually time travel and change it. By the end of the season, the foreseen impending disaster is actually averted, albeit in a less than ideal way.
- On Sliders, the Big Bad of the last season is trying do, he experiments by first merging people from different universes together.
- Like the comic it was adapted from, Crisis on Infinite Earths did this for the Arrowverse, creating a reality born from a mixture of Earth-1, Earth-38, and Earth-BL.
- Reversed in the computer game The Longest Journey: the idea is to prevent the two worlds from combining, at least under the current uncontrolled conditions.
- Tales of Symphonia ends up with this being the goal of the main characters, although for much of the second half of the game they are under the mistaken impression that they need to do the exact opposite in order to Save Both Worlds. It just so happens that the resulting combination ends up being the world map of Tales of Phantasia.
- It doesn't quite go as planned, as shown by the sequel/spinoff that came after. Only when Ratatosk (in the Good Ending) decides to rewrite the laws of nature so that life does not need mana to survive does everything ultimately work out.
- In Tales of Eternia, the two main worlds begin colliding. The heroes only manage to fix it just in time by exploding the barrier between Inferia and Celestia, blasting the planets away from each other and altering the very nature of their universe. In the final scene, one of them is planning to upgrade their spaceship so they could go between worlds and visit their friends.
- Tales of Innocence revolves around multiple factions looking to get their hands on a MacGuffin for different purposes. The main characters' is to unite Heaven and Earth into one paradise.
- A variant of the Time Travel version is the goal of Chrono Trigger, and the Alternate Universe version is the goal of its sequel, Chrono Cross.
- A rare example that's neither: In Persona 2: Innocent Sin, the heroes lose in the end, resulting in the death of one of their own, and the entire world exploding, with only a city that had earlier separated from it surviving. Philemon, one of the representatives of the Powers That Be offers them a chance to remake the world, altering it so that it's 'better', and the events of this game would never happen. They take it... but as seen in Eternal Punishment, it doesn't entirely work.
- Subverted in Final Fantasy V, where this is exactly what Omnicidal Maniac Exdeath wants to happen and the heroes are trying to prevent. As it turns out, the power he's after was sealed by splitting the world in two hundreds of years ago, and he can only release it from the Dimensional Rift by reuniting the worlds (which entails the destruction of the Crystals, so with or without Exdeath actually claiming his prize and wreaking havoc with it, everybody's pretty much screwed).
Exdeath: I will return the world to its original form!
- One of the items in the GURPS sourcebook Magic Items III is the Healer of Worlds, a MacGuffin designed specifically for this purpose.
- Something like this is done in the canonical ending in Valkyrie Profile.
- The plot of the When They Cry series.
- In Final Fantasy Crystal Chronicles Ring of Fates, the villains are attempting to use the power of Star Singers to create a world in which their god has power over the planet. The plan mostly succeeds, however they only have the ability to choose between a vast list of possible realities. In the end the heroes fulfill the trope in full, using their powers to create a truly new reality.
- In Mortal Kombat vs. DC Universe, the Big Bad is Dark Kahn, a merged version of Shao Kahn and Darkseid, who starts merging the realities of Mortal Kombat and the DC Universe, while feeding off the rage of the characters. He's also playing the heroes and villains of each world against each other, which think that the other is an invading army. Eventually, though teamwork, Superman and Raiden manage to defeat Dark Kahn and split him into two. Unfortunately for them, Darkseid and Shao Kahn end up in each other's worlds.
- Lex Luthor tries this in season 1 of I'm a Marvel And I'm a DC. Not in his universe, but the real universe. His goal was to have comics stop progressing when it was just him and Superman, back when times were simpler and they were important.
- "The Vat of Acid Episode" in Rick and Morty saw Rick merge the equally probable realities that Morty had been hopping through so only one Morty, the main one, did all those horrible deeds and allowed his counterparts to survive. The result was that now everyone (such as the SWAT Teams, the United States Supreme Courts, and the #MeToo movement) wanted their pound of flesh from Morty forcing him to jump into a vat of fake acid to escape.
- The Grand Finale of Star vs. the Forces of Evil saw the dimensions of Earth and Mewni merge.