Crossover

A crossover is a fanfic or other fan-created work in which two or more fandoms are combined in some way. Crossovers are an old story trope of fanfiction; as soon as fans started writing stories in multiple fandoms, they started crossing those sources together. In story notes, a crossover is frequently notated with an 'x', so a Star Trek story crossed over with Star Wars is sometimes written as ST/SW and sometimes written ST x SW.
Crossovers can be a love/hate topic among fans. Some fans adore the possibilities they bring, while others believe they are rarely written well - or are simply uninterested in reading about the characters in any fandom except the one they originate from. Fans will frequently make rec lists for well-written crossovers, or else post requests asking for crossover works from particular fandoms that they'd like to see combined. 
Crossovers have also been the subject of numerous communities and dedicated events (such as fests or exchanges), so that crossover lovers can connect and share the works that they love to create and consume.
==Premises for Crossovers==
Crossovers may take place in many ways. In the most common form, characters from Fandom A may meet characters from Fandom B (i.e., a Stargate Atlantis story in which The Doctor visits Atlantis, perhaps with a Companion or two in tow). Crossovers can involve as many fandoms as the author(s) can juggle; there's no limit to the potential madness and creativity of the exercise.
A form that is most common in Harry Potter crossovers, but sometimes seen in other fandoms with canon orphans (or characters who can easily be made to be orphans), is the adoption fic, in which someone from another fandom (generally selected for their kick-ass qualities) brings up the orphan.
Many fandoms use canon incidents or devices to facilitate crossovers. Star Trek's canon holodeck can be used to introduce characters from any other fandom, and its time travel allows crossovers with present-day or historical settings. In Buffy fandom the first Halloween episode involved enchanted costumes which made the wearer take on the personality of the person depicted; in the episode these were generic characters - soldiers, ghosts, etc. - and the effects wore off at the end of the spell, but in fanfic the costumes are often used to give Buffyverse characters the personality and sometimes powers of e.g. a superhero, often permanently - this is so common that it has become a cliche, the Yet Another Halloween Fic or YAHF trope. The idea has been borrowed by many other fandoms. Doctor Who introduced the "chameleon arch" which turns Time Lords into normal humans with false memories, revealed only when they open a device that contains their memories; this is often used in fanfic to turn characters from other fandoms into Time Lords.
Canon deaths which involve the disappearance of the body are sometimes used as springboards for crossovers; for example, when Sirius Black falls through the Veil of Death some stories have him emerge in the universe of another canon. This trope is also common in Buffy fanfic since Buffy fell into a mysterious portal as she died; although she did not disappear, numerous stories show her as transported to other universes in the period between her death and resurrection.
Another way of crossing two fandoms happens specially in the cases of fandoms that have non-human characters or characters with extra abilities. In this case, a character from Fandom A, while still being themselves, turns out to be (secretly or not) a type of character from Fandom B. An example of this is a character who turns out to be an Immortal from Highlander or a Doctor Who Time Lord as mentioned above.
Some crossovers are almost subliminal, like cinematic Easter Eggs, briefly using e.g. a character or device from one canon in a story set in another, which may go almost unnoticed. They are occasionally seen in canon as well as fan works. For example, The Laughing Fish, an episode of Batman: The Animated Series, has a scene in which Joker tries to kill Batman with a wrench he grabs from a box that appears to have a partially-obscured Binford Tool label, a Home Improvement reference. Buzz Lightyear is imprisoned in a box with the Binford logo in Toy Story. There are numerous Star Wars references in the Indiana Jones films, such as images of the robots among the hieroglyphics found in a tomb.When Star Wars and Indiana Jones Collide: Attack of the Easter Eggs Similar minor crossovers are common in fan works.
==Types of Crossovers==
===Real World Crossovers===
"Real World Crossovers" are RPF fanworks (usually fiction) that portray the characters on a show or film switching places with their actor counterparts. They are usually not sexual in nature. 
The first media real world crossover was Visit to a Weird Planet.
See more at Real World Crossovers.
===Fusions===
Fusions are a kind of crossover or AU where characters from one fandom (Fandom A) may be imported into the setting of another fandom (Fandom B). Fandom A characters may take on the roles of Fandom B characters (i.e., a Stargate Atlantis story in which John Sheppard is a Sith lord and Rodney McKay is a Jedi, like The Dark Side, by Astolat) and not interact with Fandom B characters at all, or only very peripherally.
Another type of fusion has a character from one fandom take the place of a character in another while retaining their original back story; for example, a story in which Doctor John Watson, a British doctor newly back from Afghanistan, ends up working in Princeton USA and finds a flat share with Dr. Gregory House, not Sherlock Holmes.
Crossover fusions with romance movies (An Affair to Remember, American Dreamer, You've Got Mail, etc.) have been written in slash forever, but for some reason, they're rarely considered crossovers; they're just considered AUs, perhaps because the romance movies rarely have a fandom following of their own.
These are popular among wuxia and xianxia writing communities in China and Taiwan, oftentimes with a connected setting merging many preexisting worlds together with other original worlds and/or reality-warping cultivators who travel between them in a large multiverse.
===Actor Crossovers===
A special case are crossovers between sources that share the same actor. These same-actor crossovers sometimes draw criticism for requiring more suspension of disbelief, and in the case of same actor pairings also for blurring the line between character and actor slash, especially in the past when RPS was less widely accepted.Lucy Gillam. Joxer?! And Other Things I Don't Get. Posted 24 November 1999. Accessed 3 October 2008. In some cases these crossovers even rate their own pairing names, communities and challenges.
In SGA fandom, a common crossover technique is to write a character of David Hewlett's (from a show other than SGA) in a romance with a character of Joe Flanigan's (also from a show other than SGA) - this crossover pairing is known as Hewligan, and can refer to a variety of pairings (i.e., Grant Jansky (Traders)/Pete Sherman (Sherman's March), Michael (Century Hotel)/Nick (Farewell to Harry).The Hewligan Fiction Archive; The Hewligan Fest community.
Other examples include the pairing names Chlean and Winsullivan, which name the crossover ship of Dean Winchester (Supernatural)/Chloe Sullivan (Smallville).Winsullivan and Winchullivan Another case is the characters played by Aidan Turner and Dean O'Gorman, who played the brothers Kili and Fili in The Hobbit (film series). Pairings include DarkHawk: Ross Poldark (Poldark) / Jim Hawkins (Return to Treasure Island), and Britchell: Bragi (Anders) (The Almighty Johnsons) /Mitchell (Being Human).
In other cases, two characters played by the same actor turn out to be the same person; for example Claude Rains from Heroes turns out to be the Ninth Doctor in disguise, or Ducky Mallard from NCIS is actually an older Illya Kuryakin from Man from Uncle. See also the Six Degrees of Jeremy Renner trope, in which all characters played by Jeremy Renner (Hawkeye in The Avengers) are Clint Barton in disguise, siblings, clones, etc. A canon non-crossover example is the case of the vengeance demon Halfrek in Buffy the Vampire Slayer, played by Kali Rocha who had previously played William's (pre-vampiric Spike's) love-interest Cecily. In a later episode it was revealed that Halfrek was Cecily; comics canon says she was already a demon when William was in love with her. One pairing of this type is sufficiently common to be named; "Barneswald" is James "Bucky" Barnes/Clara Oswin Oswald, since the same actress briefly appeared as Barnes' date in Captain America: The First Avenger while Clara is cononically reincarnated in many avatars throughout history.
Stories in which characters played by the same actor are mistaken for each other, or impersonate each other, are also common. For example, Nathan Fillion played the murderous preacher Caleb in Buffy, and author Richard Castle in Castle; a standard trope seen in most crossovers between the shows has Buffy characters attack Castle as soon as they see him, assuming that Caleb has somehow come back to life. In non-crossover canon much of the plot of Orphan Black revolves around repeated cases of same-actress impersonation or mistaken identity.
These themes can be inverted in stories in which different versions of the same character (portrayed by different actors or in different media) meet; for example, versions of Superman from Superman Returns and Lois and Clark: The New Adventures of Superman, Sherlock Holmes from Sherlock and Elementary, etc. Usually the explanation involves Alternate Universes. This is a common trope in the canon for comic books where there are multiple versions of the same character; see, for example, the animated movie Spider-Man: Into the Spider-Verse (2018) whose plot is a multiple crossover of this type.
Another variant of actor crossover is a crossover between the fictional and "real" worlds, with actors meeting or swapped with the characters they play; for example, Jensen Ackles meeting Dean Winchester, Robert Downey Jr. swapped with Tony Stark, etc.
===Same Name Crossovers===
A common if trope takes two fandoms which happen to have characters with the same name. An example is Scott Summers and Buffy Summers, and there are several stories where they are cousins or otherwise related. This can be stretched slightly by ignoring differences in the spelling of the surname - e.g. Jamie Somers (The Bionic Woman) is also related to Buffy, but a different branch of the family that changed the name slightly. There are stories where Samantha Carter (Stargate series) is related to Agent Carter (Marvel) or Sheriff Carter (Eureka). In several stories Sirius Black is related to Bernard Black. It's even occasionally extended to fandoms where characters have common first names, if the name is rare enough; e.g. Xander Cage (the XXX series) and Xander Harris (Buffy), and to names that just "sound right"; e.g. Luna Lovegood (Harry Potter) has a name that "sounds sexy", so she might be written as a Bond girl.
An alternative approach is to treat common names as a coincidence which results in the events of the crossover; e.g., Buffy and Scott happen to reserve rooms at the same hotel and the desk clerk somehow thinks they're married and ends up putting them into the same room (bed-sharing trope); or a message intended for the Watcher Bernard Crowley (Buffy) ends up going to the fallen angel Crowley (Good Omens). This approach is comparatively rare.
===Shared Traits===
Common appearance and other traits have often been used as an excuse for a crossover; two canon characters are alike in some way (they have similar ancestry, have red hair, have the same accent, are fencing masters, etc.) so must be related or share some common background. This is very common in Harry Potter crossovers, with numerous red-headed characters from other fandoms (most notably Willow Rosenberg and Natasha Romanoff) written as relatives of Lilly Potter, the Weasley family, or both, regardless of plausibility. Or James Bond's Q as well as Merlin can be seen as Sherlock's relatives due to the physical similarity of both three characters, with kinship presentations ranging from fraternal to paternal.
===Location Crossovers===
Another way of combining sources is to build on their use of common locations. For example, The Avengers Movieverse has probably been crossed with every TV show or film that has a contemporary New York setting, and Angel with Six Feet Under and other Los Angeles shows. CSI Miami has been crossed with Burn Notice, Dexter, and other shows with a Florida setting. Another example is Wholock.
===Historical Crossovers===
Fandoms which draw on the same historical period are another source of crossovers. An example might be a crossover between Jonathan Strange & Mr Norrell and the Temeraire novels, since both are set in the Napoleonic wars. World War II crossovers are very common, especially with Captain America. For example, since Wonder Woman is now depicted as active since World War I there are numerous stories which envisage her teaming up with Steve Rogers during World War II, and the parallels between Rogers and Steve Trevor are often mentioned. All time travel fandoms are fair game for such crossovers, of course, as are those involving immortality, especially Highlander.
===Same Creator Crossovers===
In this type of crossover two or more works by the same creator, or from a common origin, are crossed even though this never occurred in canon. For example, the Sherlock Holmes and Professor Challenger series (The Lost World etc.) were both created by Sir Arthur Conan Doyle, but the series have no characters in common. Numerous authors have written stories combining them, both as fanfic and as professionally-written "continuations" of these series.
===Crackfic Crossovers===
 Some crossovers are motivated by simply trying to find universes that couldn't possibly by crossed over, and then pulling it off. Or not. Purists only cross universes that could possibly exist in each other's reality, and have more or less the same tone. Non-purists admit to no limits.
===Het and Slash-focused Crossovers===
Often crossovers are an answer to the problem of a much-loved character who lacks a shippable partner in his or her source fandom, or else an answer for a writer who only likes one character of a popular pairing—like Methos, but not Duncan? Write Methos into another universe altogether! Certain characters seem to lend themselves to showing up in other universes; they are sometimes referred to as Little Black Dresses of fandom.
Forever Knight fandom has a small faction, the Nothers, devoted to romantically involving Natalie Lambert with characters from other TV shows.
=== Death Battle ===
A genre of fanwork that pit two characters (usually from two different fandoms) against each other to determine who would win in a fight.
==Using Official Crossovers==
It's not unusual for two or more fannish sources to have crossover episodes or events in canon. Typical examples are comic company crossovers between DC and Marvel, like the JLA vs. Avengers mini-series, and crossovers between Batman and Judge Dredd, Predator, etc.
TV shows also do crossovers, especially ones made by the same production company or owned by the same network. Sometimes they are build as a shared universe from the start, even as part of the same franchise, while in others the crossover idea comes when both are already established. They may take the form of double episodes or just run in one of the shows. Some examples are:
* Same universe:
** Eureka, Warehouse 13 and Alphas
** Homicide: Life on the Street, Law & Order's franchise and OneChicago's franchise
* Double episodes examples:
** CSI: Las Vegas and Without A Trace
** NCIS: LA and Hawaii Five-0
** Magnum PI and Simon & Simon, also Magnum PI and Murder, She Wrote
** The Pretender and Profiler
** Crossing Jordan and Las Vegas
* Character from one universe showing up in the other:
** Cold Case's Det. Scotty Valens in CSI: NY
** Hawaii Five-0's Kelly and Kono in MacGyver (2016 reboot)
** St. Elsewhere's Dr. Roxanne Turner in Homicide: Life on the Street
** Homicide: Life on the Street's John Munch showing up, in character, on the X-Files, Arrested Development, The Wire and The Beat
* People from reality shows appearing as themselves in a fictional show:
** American Pickers' Mike Wolfe in NCIS season 15 episode "One Man's Trash"
** The X-Files episode X-Cops was a crossover with the "reality" crime show COPS, though in this case using actors instead of real police.
In some TV series the official crossover implications are almost byzantine through a series of such overlaps, and tracked on fansites devoted to this phenomenon.Poobala.com's Crossover Spin-Offs Master Page Doctor Who and Torchwood are so intertwined that many authors and sites consider them to be a single fandom; The Sarah Jane Adventures also derive from the same canon, and stories that mingle canon from all three shows plus spinoff novels etc. are moderately common. The most recent spin-off Class (2016) has yet to impact this fandom to the same extent.
Arrow and its spin-offs The Flash, Legends of Tomorrow, and Vixen are often entwined with each other, fans often nicknamed the universe Arrowverse, Flarrow, and Legends of Flarrow. When NBC cancelled Constantine, it allowed the CW to have an official crossover between the two and thus the others. The official crossover episode between The Flash and the CBS Supergirl pleased many fans as did Supergirl's move to the CW; which officially brought more news of more crossovers between all four shows. The Supernatural episode Scoobynatural (2018) was a Supernatural/Scooby-Doo crossover, largely animated, which seems likely to spawn a good deal of crossover fiction.
An episode of the Star Trek animated series was an adaptation of Larry Niven's story The Soft Weapon, and Kzinti (warrior aliens from Niven's work) subsequently became part of the Star Fleet Battles wargame universe.
==Crossovers and Meta==
Sometimes the point of a crossover is a contrast and compare of the fannish sources. A meeting in a bar between Duncan (of Highlander) and Buffy, talking about the pain of being a Champion, or between Methos and Krycek, talking about the fun of being morally ambiguous killing machines. Sometimes the point is even broader, such as commenting on the pain of being a black sidekick, as in Them Mean Ol', Low-Down, Lando Calrissian Blues, by Yahtzee,Them Mean Ol', Low-Down, Lando Calrissian Blues - Yahtzee or the trials of being a fictional character popular in slash fiction, as in Support Group for Fan Fiction Characters: First Meeting, Slash Chapter by Cousin Shelley."Support Group for Fan Fiction Characters: First Meeting, Slash Chapter" by Cousin Shelley
==Crossover Fandoms==
Some crossovers become so popular they gain fandoms of their own. Examples are Rise of the Brave Tangled Dragons, Superwholock, Pooh's Adventures, Non/Disney, DP x DC, most Animash and Fallout: Equestria (note: some of these are fandoms that grew around specfic fanworks but not all of them.)
==Fan Comments== 
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===Crossover Filtering on AO3===
In 2018, AO3 rolled out a major update to its searching and filtering functionality that included the option to filter for or exclude crossovers - which was a source of excitement for crossover lovers and haters alike.
== Examples of Crossover Fanworks ==
===Crossover Fanfiction===
:For a full listing of Crossover fanfiction on Fanlore, see :Category:Crossover Fanfiction
* A pre-internet crossover is A Meeting in the Hyades by Marion Zimmer Bradley, in which Aragorn from The Lord of the Rings appears in an early version of Darkover; first published in 1961 but written in the 1950s.
* An example from 1954 - Dorothy L. Sayers wrote The Young Lord Peter Consults Sherlock Holmes for the BBC's Radio Times magazine.
* One of the earliest online multifandom crossovers was "The Witness" by Michele Martin, which crossed X-Files, Forever Knight, Highlander, Starman (tv), and Quantum Leap, along with several cameos from other fandoms. It was archived on Gossamer on May 16, 1995.
* Wherever You Stand A Hundred Shall Fall by James Walkswithwind is a Batman/Sentinel crossover ~ 1996-7
* When Hellmouths Collide by Kimberley Rector and Martha Wilson is a Buffy the Vampire Slayer/Hercules: the Legendary Journeys crossover. (1999-2002)
* Battle Rat is an Iron Chef/X-Files crossover by The Spike. (2000)
* Donna the Vampire Slayer by Nomad (nomadicwriter) is a Buffy/West Wing crossover, the first of a trilogy (2001)
* Them Mean Ol', Low-Down, Lando Calrissian Blues is an influential humorous multifandom crossover by Yahtzee, highlighting the underutilisation of male characters of color in popular television shows (January 2002)
* Hell Money by FayJay is an early example of Buffyverse/Smallville, which would prove a rich crossover playground (May 2002)
* The End of the Beginning by Mariner is a popular early Buffyverse/Harry Potter crossover (2003)
* Laura Mason's "Wrightsville: Long Ago and Far Away" is a crossover between The Charioteer and Ellery Queen (2006–7)
* Professor Doyle by Lucinda uses the canon death and disintegration of the popular Angel character Doyle to propel him into the Harry Potter universe. Angel/Harry Potter (2006-2017 WIP)
* Dust in the Wind by Lyra_wing was a SPNxAmerican Gods story (March 2007)
* And All the World Beneath by Seperis was a famous SGAxSPN story (August 2007)
* Supersaturation by SkoosiePants is SGA/Bandom (2007–9)
* "House of Cards" by nevoreiel and "Escape from Solitude" by mysid are crossovers between Torchwood and Mary Renault's novel, The Charioteer (2007 & 2010)
* The Eighth Weasley by Fyre (2001-8) is an example of the "shared trait" type of crossover, in which Willow Rosenberg is a long-lost member of the Weasley family.
* Angel, Dr. Horrible's Sing-Along Blog: In Memory of Penny Lesse by Jedi Buttercup. Just when you feel you've almost drowned, you find yourself on solid ground. (2008)
* "You Are Cordially Invited" (and its sequels) by fawatson is a futurefic crossover with characters from at least four modern novels by Mary Renault (April 2008)
* The Kingdom of the Blaggers by Hackthis is a crackfic fusion: "The problem with being the son of Uther Pendragon, legend of stage and screen, winner of Emmys (twice), Tonys (once), Oliviers (multiple), BAFTAs (twice), Oscars (once) and People's Sexiest Man (twice) was that nobody was ever going to take Arthur seriously as an actor in his own right." (2009)
* Labyrinth, Pan’s Labyrinth: A Lost Child in a Forgotten Tale by amelia_petkova. Ofelia wishes her brother away but not for the reasons you might think. (2010)
* "Confidence Lost" is a 33-chapter Batman/White Collar crossover by C.R. Scott (2011)
* Buffy, Teen Wolf: Botched by Rivulet027. Derek botched Dawn’s rescue attempt or Dawn botched Derek’s rescue attempt. Either way Stiles and Isaac rescued themselves. (2012)
* The Avengers Movieverse, Doctor Who: Make It Your Strength series by kerrykhat. "I'm Doctor Martha Jones," she told the pale man in the black, gold, and green armor who had invaded UNIT. "Who the hell are you?" (2012 – now)
* The Avengers Movieverse, Hansel and Gretel: Witch Hunters: By Any Other Name by [Liannabob]. "A Clint/Hansel mindswap fic with a whole lot more plot than that statement might imply. I mean, lots of crossover shenanigans, of course. But also a plot." (2013)
* Superman Returns, Lois and Clark: The New Adventures of Superman: The Planes by Dandello. "When Superman and Lois are thrown into a world where Clark Kent is EnC of the Daily Planet and married for ten years to Lois Lane, things get more than a little strange for both sets of Lois and Clark." (2006-7)
* Harry Potter, Stargate SG-1, Buffy, Batman, The Bionic Woman, The Secret World of Alex Mack: The League of Extraordinary Women by Diane Castle. "Hermione Granger has to recruit six women to help her stop an army of monsters before her world is overrun. But none of the women are even in her dimension…" Start of a series now running to nearly two million words, taking in dozens of fandoms, with "side stories" by at least nine other authors.
* Sherlock, Elementary: Elementary, My Dear Sherlock by Eltuine. "Joan Watson wakes up in an unfamiliar house in an unfamiliar city, with an unfamiliar man staring at her, claiming to be Sherlock Holmes. Meanwhile, on the other side of the ocean, John Watson finds himself in a similar situation. When each Watson tries to return home, however, difficulties arise. How will both Sherlocks deal with the removal of their respective Watsons, and how will each Watson get back to where they belong?" (2013- WIP)
* Star Trek: The Next Generation, Buffy: Legend by Shayne Terry. "Trapped by an alien collector, Lieutenant Commander Data discovers an early 21st century android excavated from the ruins of Sunnydale and a capsule containing the frozen body of one of the Eugenic wars most notorious figures...Buffy Summers." (2011)
* Young Wizards, Callahan's Bar series - Spider Robinson: Callahans by Avida calandia. Considering the precedent set by our predecessor, Callahan’s Place, we should’ve known it would only be a matter of time before something strange and wonderful walked in. (2012)
* Buffy, X-Men: Buffy and the X-Men by Plato: Buffy runs away to New York instead of LA in hopes of starting a new life. (2003)
* Mr. Benn, The Invisibles, RPF: Mr. Benn: Invisible by dontmakeeyecontact. When Jack Frost and Jolly Roger find they need to break into a record company’s impregnable headquarters they call upon the help of a singular individual. Crossing a popular British children's cartoon series of the 1970s with Vertigo's The Invisibles and rock RPF. (Date unknown)
* Doctor Who, Nero Wolfe: The Orchid Thief by leviathan: Nero Wolfe and Archie Goodwin have solved a lot of tough cases in their careers as detectives. But never one like the one that begins with the new arrival in the Plant Rooms. Before it ends, they'll deal with a tattooed lady, miniaturized corpses, and Things from Another World! (2009)
* Addams Family, Angel: Her Beauty and Her Terror by ijemanja: Amanda Buckman moved to California, changed her name, and became a vampire. Wednesday can't help but approve. (2007)
* Buffy, Avengers, Supergirl: Origin Story by Worldmaker: Halloween ends, and Xander finds himself in a place he never thought was real, under circumstances he never saw coming. (2013-2021)
* Kerbal Space Program / Surprise Crossover: The Next Frontier by JakeGrey: The Kerbal Space Program develops FTL travel and its explorers find some surprises during their first interstellar expedition (2013)
* Harry Potter, Black Books: Noble and Most Ancient by Nomad (nomadicwriter): Bernard's past catches up with him - by owl post. (2013)
* Pooh's Adventures Of Façade, a crackfic crossover of multiple fandoms, including Pooh's Adventures, Kirby, Kingdom Hearts, and McDonald's by Psyga315.
* Harry Potter, Doctor Who: The Rising Storm by TardisIsTheOnlyWayToTravel: Harry Potter opens a fob watch, and his life and destiny is changed forever. (Story series, 2014 - now deleted, link via webarchive.org)
* Doctor Who, Sherlock: Blurred Lines by Dont_call_me_Carrie: In one life, Martha Jones left the TARDIS, helped her family pick up the pieces, moved on with her life, and later got married to Mickey Smith. This is not that story. Or, Martha Jones replaces John Watson. Cue divergences. (2016- WIP)
* Immortal Women, a Highlander/Forever Knight crossover by Lynn Levine.
* Biomass Effect, a Mass Effect & Prototype crossover fic by Beastrider9.
* Breaking the Chains, a The Professionals and The Scarlet Pimpernel slash fic from 2004
* do you believe in soulmates (because I'm yours and you're mine) by geralehane, a The 100/Fear the Walking Dead crossover involving the fanon crossover character of Elyza Lex. (2016)
* As N Approaches Infinity by Corisanna is a popular Puella Magi Madoka Magica and Bleach fic.
* There May Be Some Collateral Damage by metisket is a Bleach and Harry Potter crossover in which Ichigo is assigned to protect Harry at Hogwarts during the latter's fifth year.
* Pokémon Crossing is a Pokémon and Animal Crossing crossover where the Animal Crossing villagers live in the Pokémon world.
* , an Alice in Wonderland and Harry Potter fic featuring (Luna Lovegood/Alice Kingsleigh) by Empatheia
* Cross the Gate - Stargate SG-1 and Stargate Atlantis crossover zine (2013-2014)
* Danny Williams and the Case Of The Consulting Detective Hawaii Five-0/Sherlock by apetslife (2011)
* The Story to End All Stories, by MystExplorer/Bastian, itself a massive crossover fic spanning multiple universes: Fiction itself is at risk. Who can save it? Only the most capable heroes pop culture has to offer. (2015)
* Dharma & Jim by Sheffield (The Sentinel / Dharma & Greg)
* Crossed Out by CarolROI (Sentinel/Highlander)
* Tryst by Roxie130 (Sentinel/Stargate SG-1)
* Crossover Chaos by Elwynn James and Jessica McKinney (2011-2024). The first incarnation started with a crossover between animated television series Fanboy and Chum Chum and Sidekick and evolved from there to include many other series. The second incarnation, also known as SPIN, is a fan-sequel of The Monkees film HEAD (1968) and includes the band as well as various animated characters.
===Crossover Art===
* Sherlock, Harry Potter: Fan Art: Transcendental: a Harry Potter/Sherlock Crossover (2016) by ObsessedtwibrarianOTB, cover art for a fanfic
* Tommy - The Who, Harry Potter: Pinball Wizard (2015) by Lovcats, Tom Riddle as Tommy.
===Crossover Videos===
:For a full listing of Crossover vids on Fanlore, see :Category:Crossover Vids
* Star Wars, COPS: Troops (1997) written/directed by Kevin Rubio, a fan-made and acted video based on the Tatooine scenes from Star Wars: A New Hope
* True Blood, Queen of the Damned: Drink Me (2012) fan mix by Bironic - "The power of the blood of the First."
* Multiple Fandoms: Starships! (2012) fan mix by Bironic - one of the most famous fan mix videos, fusing scenes from dozens of science fiction sources into one music video.
*Night at the Museum, Hannibal, others: Night at the Museum Crossover (Fanvid Edition) (various dates) by Pheeby - a series of fan mix videos combining Night at the Museum with other fandoms.
*Inception, Team America: World Police: Team Inception: Dream Police (2010) by Matt Shapiro - Team America video with soundtrack from the Inception trailer.
*Pirates of the Caribbean/The Hobbit: Hobbits of the Caribbean: On Stranger Tides by Itar94 - "Parody crossover trailer made by adding Hobbit clips (AUJ+DOS) to the soundtrack of the official PotC: On Stranger Tides trailer. Not serious at all"
*Spies In the House (2008) by dearratboy - crossover of Man from U.N.C.L.E. and Mission: Impossible
==Example Art Gallery==
File:Alex and desmond by neofox.jpg|Alex and Desmond by neofox (2010) (Assassin's Creed/Prototype)
File:Heaven or Hell or Somewhere in Between.png|Art by usarechan created for Heaven or Hell or Somewhere in Between as part of the 2012 SuperWho Big Bang, this image showing an interaction between Castiel and the Eleventh Doctor (SuperWho)
File:An equestrian journey.png|An Equestrian Journey by Hewison (2013). Notably, the MLP fandom has a significant amount of crossover and fusion artworks. 
File:Meeting of the minds.png|Meeting of the Minds comic by Wertyla (2016) (Star Trek TOS/Jeeves and Wooster) 
File:Baselines5-3.jpg|The droids from Star Wars meeting Doctor Who from Baselines #5 art by Anna M. (1986)
File:Engard5-1.jpg|Art by Kathy Bushman from En Garde #6 (1968) (Star Trek TOS/The Avengers)
File:Celestialtoybox16-9.jpg|Art by Tye Bourdony from The Celestial Toybox #16, where characters from Battlestar Galactica (1978) meet characters from Star Trek: TNG (2000)
==Thematic Lists for Crossover Fic==
* List of Forever Knight crossovers by fandom
* List of Starsky and Hutch crossovers
* Recs tagged crossovers/fusions at Fancake
* Star Trek/Sherlock crossovers: works tagged treklock at AO3
* The Professionals
==Meta/Further Reading==
* Same Actor Crossovers (response to Lucy Gillam), Shomeret at The Fanfic Symposium (1999)
* (April 2000)
* The Ten Commandments of Crossovers, Lucy Gillam at The Fanfic Symposium (2001)
* Crossovers, Kadorienne at The Fanfic Symposium (2002)
* Jane Davitt, (2008)
==Communities & Events==
===Communities/Archives===
*crossover_news: A fannish newsletter for crossovers
*Crossoverfic.com: An automated archive for crossovers that went offline in mid-2010
*crossoverfans: A Livejournal community for fans of crossovers, active from 2010-2016
*Crossover Fan Fiction: A LJ community "dedicated to authors and readers of crossover fan fiction"
*Twisting the Hellmouth: A dedicated archive for Buffy the Vampire Slayer and Angel crossovers
*Wormhole Crossing: A dedicated archive for Stargate crossovers, offline since early 2015
*Crossover category on Amor Yaoi (Spanish)
===Events===
*In 2004, the Crossover Awards were established to recognize the crossover genre. The 2004 Winners are archived here and the 2005 nominees are archived here.
*Crossover Galore Challenge: A LJ community for crossover fanfiction from a variety of fandoms. Only one or two word prompts were accepted. It ran for 13 challenges between 2007 and 2012.
*Crossover Big Bang: A multifandom Big Bang challenge for crossovers with a minimum word count of 15,000 words, hosted from 2011 to 2013.
*Crossovering: A multi-fandom crossover exchange, hosted annually from 2014-2018.
== References ==
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