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Obvious Crossover Method
A specific species of Fandom Specific Plot, an Obvious Crossover Method is any method or episode that has sufficiently obvious crossover possibilities that it is regularly used to set up crossovers. Particularly easy if the series involves Alternate Universes, wormholes, Negative Space Wedgies, travel across fictional works or a big, galactic setting where works with a smaller focus could be hidden away from the canon maps. A Mutual Masquerade is another useful plot device.

Before adding an example, think if the method has been used frequently enough to qualify as a Fandom Specific Plot; if it doesn't, it doesn't go here.

Compare Sailor Earth (a Sister Trope of a gap in the setting that can be filled with an Original Character, a minor character, or, overlapping with this, a crossover character), The Stations of the Canon (which is more about a frequent side effect; this is about a possible cause).


Examples:

    open/close all folders 

    Anime and Manga 
  • Ranma
    • The Nanban Mirror from a filler episode allows time-travel crossovers.
    • Before arriving at the Tendos' home, Genma and Ranma visited or trained with some characters from the crossover series during their travels. Ranma being engaged to a character from the other series is not required, but frequently goes along with this.
    • Revisioning Ranma's mother, Nodokanote  as related to characters from the crossover series, which gets revealed in time for the plot to kick in.
    • Also common: Ryouga wanders into another series.
    • Rarer: Ranma, or another character (canonically Jusenkyo-cursed or otherwise), falls into the Spring of Drowned [Crossover Species] or [Crossover Character who ends up possessing the newly afflicted].
  • Neon Genesis Evangelion fanfiction often has Shinji Ikari being raised by crossover characters (instead of his unnamed caretakernote ) before being called back by Gendo.
    • Being pulled through the Dirac Sea to another (crossover) universe during the fight with Leliel.
  • The Gate from the 2003 Fullmetal Alchemist anime. We know it leads to one parallel universe, so why not another?
  • The Springtime Summoning Ritual in The Familiar of Zero.
  • Hell Girl crosses over effortlessly with any halfway realistic series: just have a character get desperate and call on the rumoured Enma Ai for assistance. This probably explains its massive crossover list on Fanfiction.net.
  • Because the characters of Axis Powers Hetalia are supposed to exist in the real world but living in secret, it's quite easy to write a character meeting them. Bonus points for if that character's nation of origin/wherever they live at the moment is known, and/or if they were involved in a major historic event that a Nation would likely have been involved in.
  • Super Dimension Fortress Macross (and/or Robotech) crossovers can have the SDF-1's first hyperspace fold take it even further than Pluto. (This can also be used to explain the final fates of Hikaru Ichijo and/or Rick Hunter in post-series fanfic.)

    Comic Books 
  • As a rule of thumb, due to superhero universes taking place in a single city following a single character amid an entire world which could conceivably (and often does) also have other heroes and adventures going on at the same time, superheroes are very easily crossed over with each other - even if those superheroes aren't in the same universe or company, unless things are titanically different it doesn't take much doing to plop their city into the other universe and make it work adequately.
  • The Endless concept from The Sandman qualifies; given the nature of the cosmology in that plot, literally every universe ever imagined has existed, and the Endless represent fundamental concepts such as Death, Desire, Dreams, and Destiny. Usually the crossover is a brief encounter between a character and either Death or Dream, in that order of probability.
  • The Multiverses of DC Comics and Marvel, along with lesser-known examples like Wildstorm's "Snowflake", are easy to stretch to include other crossover settings. (It's kind of canonical that the Marvel and DC multiverses include each other.)

    Film 
  • Star Wars takes place in a large, old galaxy with lots of obscure backwaters, lost history, and even unexplored space. As such, it's easy to take a series that's limited to one or just a few planets and drop it into the Star Wars galaxy, allowing Star Wars characters to land there or abduct others and take them back to the wider galaxy. Heck, the official Databank on starwars.com did it at one point as an April Fools joke, adding entries for characters from Willow written as if they lived on the planet Andowyne in the Star Wars galaxy.

    Literature 
  • Harry Potter
    • A crossover character raises Harry instead of his aunt and uncle.
      • A crossover character turns out to be a distant (or not) relative of Harry's that the Dursleys never talk about.
    • Falling through the Veil from Harry Potter and the Order of the Phoenix, allowing other characters to enter the Potter-verse and Potter-verse characters to land in other worlds.
    • For a fantasy series, having the central characters either attend or teach at Hogwarts.
    • For a series with teen protagonists, they attend Hogwarts as "transfer students", and are conveniently placed in Harry's year.
  • Discworld
    • Dimensional instability caused by magical accidents can lead to unexpected characters popping up from any other reality.
    • Any setting with a library is connected to L-Space, and therefore to the Library of Unseen University.

    Live-Action TV 
  • Buffy the Vampire Slayer has at least three:
    • "YAHF" (Yet Another Halloween Fic), the many, many stories based on the second season Halloween episode where a spell makes everyone Become The Costume.note  Naturally, a crossover is as simple as changing what The Little Shop That Wasn't There Yesterday had in stock that day.
      • It is even simpler when the crossover character is a ghost, noblewoman, or soldier.
    • Buffy jumping through a portal at the end of the fifth season.
      • For a variation, some other character will take Buffy's place.
    • The "Slayer Speculation Fic", where a crossover female character gets Called as the Slayer.
  • Since Doctor Who can theoretically take place anywhere in time and space, it's pretty easy for it to have crossovers with anything just by having the TARDIS land there. Even in cases where the other work's universe conflicts with that of Doctor Who, there are rare occasions in which the TARDIS travels to other universes, or else the Timey-Wimey Ball can be used to explain that time has been rewritten to match the other series.
  • The sliding device from Sliders simply drops the characters in the crossover world.
  • Fringe has alternate world travel in the later seasons.
  • Stargate Verse
    • Malfunctioning Stargates, or simply a new dialing connection, lands the Stargate characters in another franchise. Alternately, technology or magic from the other side opens a portal that spits out the characters in Stargate Command. Alternate world travel and time travel are also in-canon options.
  • Kamen Rider Decade has the plot of "Tsukasa and his friends travel from world to world", so needless to say there's plenty of scope. Furthermore, if you take Decade's crossover movie with W and Super Hero Taisen as canon, pretty much every Japanese live-action superhero owned by Toei can cross over with each other. It doesn't help that after their trip to the Nine Rider Worlds, they got to a whole new set of worlds, one of which was a world that lacked any Kamen Riders at all (That's not to say it lacked any protection). And considering how their travels are random and there's an And the Adventure Continues moment in the Grand Finale...
  • Supernatural can have an angel or a supernatural object transport characters to other fandoms.

    Tabletop Games 
  • The world of Rifts was practically built for crossovers — one never knows where a Rift might lead.
  • TORG was also built for crossovers, since the main premise of the game is that alternate realities are 'invading our world' and overwriting it.
  • WarHammer 40000 crossovers usually involve a mishap with the warp

    Video Games 
  • Like the example for superheroes in the Comic Books section above, it's trivial to imagine that the characters of different fighting games set Next Sunday A.D. are simply competing in different circuits or tournaments, and can cross over with no difficulty. (E.G. Capcom vs. Whatever.)
  • Kingdom Hearts as a whole, given the nature of its cosmology.
  • Touhou's Yukari Yakumo has been known to "spirit away" unsuspecting individuals from outside who she takes an interest in and take them to Gensokyo.
  • The malfunctioned slipspace portal at the end of Halo 3.
  • Mortal Kombat's mythos holds that "Your world is but one of many realms", allowing the title tournament to be held in pretty much any world.
  • Mass Effect often has the canon Systems Alliance replaced with the government of humanity from another group from fiction.
  • Bioshock Infinite, and by extension the rest of the series, thanks to the infinite worlds shown at the end of the game.
  • The D'ni of Myst can link anywhere. So your whoever is just strolling along when suddenly there's a guy with a book in front of them...
  • Super Mario Bros. has warp pipes. They can lead ANYWHERE, even to other dimensions.
    • The Void from Super Paper Mario. It threatens all worlds, so that can easily translate to 'whatever fictional world the author wants to tie in with it'. Same with the powers to travel dimensions/alternate universes.
  • Sonic the Hedgehog's Sonic Storybook Series features Sonic being sucked into a storybook world where everyone looks suspiciously like his friends, except for one woman with purple hair and the male villain. Fanfics often feature Sonic venturing into other classic novels or myths, or occasionally even more contemporary pieces. Whether everyone resembles his friends, or whether the purple-haired woman or male villain appear, varies.
  • As Chris Sims of Comics Alliance remarked, "If Robin Hood served under King Richard I during the Third Crusade, then he and Altair from Assassin's Creed were in the same place at the same time. You can have that one for free, fan-fiction writers."
  • This is taken to new extremes in Project X Zone, a crossover of dozens of incompatible universes. It's accomplished by various time-space anomalies which, by necessity, make basically no sense, but which the game will not shut up about.

    Visual Novels 
  • The entire concept of Servants from Fate/stay night means that it's easy to summon a crossover character as a Servant. There are even canonical examples of fictional characters being summoned, so they don't even need to be established as previously existing in the same universe. And conversely, characters from other settings starting their own Grail Wars.
  • With the Ace Attorney series, all you need to do is have Phoenix be hired by any fictional characters of your choosing, so he can get their friend off of a murder charge. Since Ace Attorney has plenty of strange people and ambiguously magical elements (the channeling, Apollo's ability, etc), writers are really only limited by their ability to write a good turnabout mystery.

    Webcomic 
  • The game of SBURB from Homestuck assembles a group of adolescents from one universe and brings them to Skaia, which is mostly the same in each game — which means it's easy to have crossover characters interact with Jack Noir and other natives of Derse or Prospit. Since other universes have interfered with canon sessions, involving multiple non-Homestuck series is also possible in a crossover fic.

    Web Original 

    Western Animation 
  • My Little Pony: Friendship Is Magic: Twilight Sparkle messes up a spell, landing character X into Equestria, or alternately landing one or more ponies into setting Y. (Which is also a Fandom Specific Plot on the mold of "Twilight messes up a spell, causing whatever the hell you want to write about", but it's particularly good for this.)
  • Total Drama Island has 'what if [teenage character from another franchise] was a contestant?'
  • In a similar vein to the Gate from the 2003 Fullmetal Alchemist anime, Danny Phantom has all of the unnamed doors in the Ghost Zone. Who's to say that one of them doesn't open to a different fandom? There's also the naturally-occurring portals into the Ghost Zone that canonically transverse spacetime, which can be used for any number of crossovers.
  • Teenage Mutant Ninja Turtles (2012): After the Manhattan Project episode, expect to see a ton of Kraang portal-based crossovers.


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