Fictional crossover

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A fictional crossover (short: crossover) is the placement of two or more otherwise discrete fictional characters, settings, or universes into the context of a single story. They can arise from legal agreements between the relevant copyright holders, unauthorized efforts by fans or common corporate ownership.

Official crossovers[edit]

Crossovers often occur in an official capacity in order for the intellectual property rights holders to reap the financial reward of combining two or more popular, established properties. In other cases, the crossover can serve to introduce a new concept derivative of an older one.

Crossovers generally occur between properties owned by a single holder, but they can, more rarely, involve properties from different holders, provided that the inherent legal obstacles can be overcome. They may also involve using characters that have passed into the public domain with those concurrently under copyright protection.

A crossover story may try to explain its own reason for the crossover, such as characters being neighbors (notable examples being the casts from Golden Girls and Empty Nest) or meeting via dimensional rift or similar phenomenon (a common explanation for science fiction properties that have different owners). Some crossovers are not explained at all. Others are absurd or simply impossible within the fictional setting, and have to be ignored by the series' respective continuities. Still others intentionally make the relations between two or more fictional universes confusing, as with The Simpsons and Futurama, where each show is fiction in the other.

Comics[edit]

Archie Meets the Punisher (August 1994). The Marvel version, with identical content but a different cover, was titled The Punisher Meets Archie. Cover art by Goldberg & Henry Scarpelli.

Crossovers of multiple characters owned by one company or published by one publisher, have been used to set an established continuity, where characters can frequently meet within one setting. This is especially true of comic book publishers, as different characters in various Marvel, DC or Valiant comic books frequently interact with one another since they live in a "shared universe". For example, in the Marvel Comics universe, Spider-Man has frequent dealings with another Marvel hero, Daredevil, just as in the DC Comics Universe, Batman and Superman often collaborate. In comic book terminology, these "guest star" roles are common enough that they are not considered crossovers. A crossover in comic book terms only occurs when a story spans more than one title. This has led to "crossover events", in which major occurrences are shown as affecting most or all of the stories in the shared universe.

The earliest such crossover event was Gardner Fox's Zatanna's Search, which took place in Hawkman #4 (October/November 1964), Detective Comics #336 (February 1965), The Atom #19 (June/July 1965), Green Lantern #42 (January 1966), Detective Comics #355 (September 1966), and Justice League of America #51 (February 1967). This story dealt with Zatanna attempting to reconnect with her father, Zatara, and seeking the aid of Hawkman, Batman, Robin, The Atom, Green Lantern, and Elongated Man along the way.

The first major crossover event was spearheaded by the Marvel Editor-in-Chief at the time, Jim Shooter. As a way to further toy sales he devised the Secret Wars crossover which brought all the major Marvel heroes into a twelve issue mini-series to battle a common threat. After the threat was dealt with they all returned to their regular titles. This Secret Wars was hailed as both a critical and commercial success largely because the events of the crossover had lasting effects on the characters (such as the introduction of Spider-Man's black suit which would later become the villain Venom). Jim Shooter later perfected his crossover at Valiant Comics with the Unity event. Unity brought all the Valiant characters together to defeat Mothergod but was told within the existing Valiant Comics titles (and two bookend special issues). Readers were not obliged to buy all 18 chapters as the story was coherent when reading just one title, but far more layered when all were read. Like Secret Wars, the Unity crossover had lasting effects on the Valiant universe most notably the introduction of Turok, the birth of Magnus Robot Fighter and the death of a major Valiant hero.

Dark Horse Comics's Aliens Versus Predator franchise was a success that continued into many games and two movies and even an Aliens Versus Predator Versus The Terminator comic.

The comic crossovers from Raj Comics are very famous in India, in which the super heroes meet to fight a common enemy. Many of these crossovers have occurred between Nagraj and Super Commando Dhruva. In Kohram, all the heroes in Raj Universe meet to finish Haru, an extremely powerful enemy.

Webcomics creators sometimes produce crossovers; one of the first was a two-week sequence between Christopher Baldwin's Bruno and Peter Zale's Helen, Sweetheart of the Internet in 1998.[1]

In 2013, Archie Comics released a 12-part crossover of Capcom's character Mega Man, and Sega's character Sonic the Hedgehog called "Worlds Collide".

There are also intercompany crossovers these are where characters owned by 2 different companies meet, such as those from DC and Marvel such as the Amalgam comics

Animation[edit]

Cartoon crossovers are not uncommon, and most of them - like comics or live-action TV shows - will often feature characters owned by the same company or network. One example is Cartoon Network's The Grim Adventures of the Kids Next Door. It features five crossovers - Ed, Edd n Eddy, Codename: Kids Next Door, The Grim Adventures of Billy and Mandy, a reference to The Powerpuff Girls and a quote from Scooby-Doo, which are all licensed Cartoon Network series. The cast of Ben 10: Ultimate Alien and Generator Rex team up in Ben 10/Generator Rex: Heroes United. Most of the last episodes of the Lilo & Stitch: The Series (a spinoff of the film Lilo & Stitch) had crossovers with various other Disney cartoons, including The Proud Family, Kim Possible, Recess, and American Dragon Jake Long. The Jimmy Timmy Power Hour trilogy is another example, in which Jimmy Neutron and Timmy Turner switch universes. The Disney TV series Hercules, based on the 1997 film of the same name had an episode titled "Hercules and the Arabian Night" that had a crossover between the characters of the TV series and film and with the characters of the Disney film Aladdin, in which Hades and Jafar each try to get rid of each other's enemies (Hades would try to defeat Aladdin while Jafar would try to defeat Hercules). Another crossover is Rugrats Go Wild in which the Rugrats are stranded on an island where The Wild Thornberrys were at the time.

During the 1970s and 1980s, crossovers were particularly common among the Hanna-Barbera properties. Some of the earliest examples happened on The New Scooby-Doo Movies, which featured appearances by characters from Harlem Globetrotters, Josie and the Pussycats, Jeannie, Speed Buggy, Batman and Robin, and The Addams Family. Later, the Hanna-Barbera Superstars 10 set of movies involved several crossovers, including such combinations as The Jetsons Meet the Flintstones. This was taken to an extreme in the 1977-79 series Laff-A-Lympics, which was essentially a gathering of the Hanna-Barbera characters for a regular series.

Crossovers are not necessarily composed of characters under common ownership. Two of the most notable cartoon crossovers consisted of characters from different companies. Disney's movie Who Framed Roger Rabbit had characters from various companies, most notably Disney and Warner Bros. Daffy Duck and Donald Duck made a simultaneous appearance in one scene, in which the two of them exchanged blows during a piano duet. Later in the movie, Mickey Mouse and Bugs Bunny were shown parachuting together (to keep things from getting too iffy legally, Mickey and Bugs' lines were written so that each of them said exactly the same number of words in the movie).[citation needed] The film also includes cameos of characters from MGM.The end of the movie features all the cartoons from all of the animation companies joining together in song, to be concluded by Porky Pig stuttering his famous "That's All, Folks!" line as Tinker Bell ends the scene with a magical fade-out.

On October 4, 1997, The 2 Kids WB shows, Superman: The Animated Series and The New Batman Adventures, had their first crossover with the TV movie, "World's Finest", in addition to having it released on DVD.

Another cartoon crossover would occur in 1990, Cartoon All-Stars to the Rescue. This cartoon featured popular characters from children's Saturday morning cartoons, banding together to promote an anti-drug message. ABC, CBS, Fox, and NBC aired this half-hour special one Saturday morning with characters from all their networks, including Huey, Dewey, and Louie (from Disney's DuckTales), Winnie the Pooh, Tigger, Slimer (from The Real Ghostbusters and Extreme Ghostbusters), Michelangelo (from Teenage Mutant Ninja Turtles), Bugs Bunny, Daffy Duck, Alvin and the Chipmunks, The Smurfs, ALF (from his short-lived cartoon spinoff), Garfield, and the trio of Baby Kermit, Baby Piggy, and Baby Gonzo (from Jim Henson's Muppet Babies). Animation companies granted unlimited, royalty-free use of their cartoon characters for this project, a feat that has been unequalled before or since then. This cartoon was also introduced by then-President George H. W. Bush and Barbara Bush, and would be distributed to schools and video stores free of charge nationwide.

Manga artist Leiji Matsumoto has been known to cross over the characters of his various stories and characters such as Captain Harlock, Galaxy Express 999, and Queen Millennia, all of which were originally written as separate, self-contained stories. In the Maetel Legend, Queen Promethium is revealed to be having been the Yukino Yaoi, protagonist from Queen Millennia. Matsumoto has also created various crossovers with Space Battleship Yamato, an anime on which he served as director, although the rights to Yamato is actually owned by Yoshinobu Nishizaki.

The adult parody-oriented series Drawn Together features many crossovers; while some are regular cameos, such as Peter and Lois Griffin from Family Guy, others involve a personality twist, such as the homicidal version of Bambi from the eponymous film or the gay version of Elmer Fudd from the Looney Tunes franchise.

The Disney/Marvel crossover Phineas and Ferb: Mission Marvel features the Marvel heroes Spider-Man, Iron Man, the Hulk, and Thor, the Marvel villans Whiplash, MODOK, Red Skull, and Venom, and characters from Phineas and Ferb, where the storyline involves Phineas and Ferb trying to restore power to the Marvel heroes, whose powers were taken away by Doofenshmirtz.

In 2014, Family Guy and The Simpsons will each have crossover episodes. In the Family Guy episode "The Simpsons Guy", the Griffins will go on a road trip and wind up in Springfield, where they will meet the Simpson family.[2] In the Simpsons episode "Simpsorama", the characters from Futurama will travel to present-day Springfield as Bender attempts to kill Bart to prevent him from doing something that will make the future bad.[3]

Video games[edit]

Konami made the first crossover video game featuring Simon Belmont from Castlevania & Mikey from the Warner Bros. Movie The Goonies in Konami Wai Wai World for the Famicom in 1988. The King of Fighters, Marvel vs. Capcom, and many other franchises from third-party developers such as Capcom and SNK bring these licenses together.

The 2.5D fighting game series Super Smash Bros., brings various Nintendo characters together for a massive fight. The third game in the series, Super Smash Bros. Brawl introduces the first non-Nintendo characters with the inclusion of Solid Snake and Sonic the Hedgehog, of Konami's Metal Gear series and Sega's Sonic the Hedgehog series respectively.

The Namco-developed Soul series, features characters from outside of Namco's titles (Link from Nintendo's The Legend of Zelda series, Necrid, Heihachi Mishima from Tekken, Todd McFarlane's Spawn, Star Wars's Darth Vader, Yoda, and Starkiller, Lloyd Irving (from Tales of Symphonia), and Ubisoft Montreal's Ezio Auditore (from the Assassin's Creed series)). Mario & Sonic at the Olympic Games, released in Japan two months before Super Smash Bros. Brawl, was the first time that Mario and Sonic (as well as their associated characters) appeared in a game together. In the RPG Kingdom Hearts, Disney and Final Fantasy characters join forces.

Super Robot Wars are turn-based strategy games featuring a variety of Japanese mecha series from many generations, such as Mazinger Z, Gundam, Neon Genesis Evangelion, and GaoGaiGar. More recently, there has been a collaboration between Capcom and Namco, which will result in the upcoming Street Fighter X Tekken and Tekken X Street Fighter. The Disney film Wreck-It Ralph features many video game character cameo appearances.

Film[edit]

One of the first film crossovers was Frankenstein Meets the Wolf Man, in 1943. This was also perhaps the beginning of a film legacy of monsters brawling each other, such as House of Frankenstein and its sequel, House of Dracula. In 1948, the comedy film Abbott and Costello Meet Frankenstein was released. This led to Abbott and Costello Meet the Invisible Man, Abbott and Costello Meet Dr. Jekyll and Mr. Hyde, and Abbott and Costello Meet the Mummy. Then, Toho released King Kong vs. Godzilla in 1962. Forty-one years later in 2003, Freddy vs. Jason was released by New Line Cinema. In 2004 20th Century Fox released Alien vs. Predator along with the sequel Aliens vs. Predator: Requiem in 2007.

One year later, both and Puppet Master vs Demonic Toys were released by 20th Century Fox and Terry Kelley Studios.

In May 2012, Marvel Studios released The Avengers, which crosses over the superheroes from their preceding film franchises. Following the movie's release, it then became the third highest grossing film of all time.

Literature[edit]

In literature, some authors also engage in crossovers by including characters from different novels they have written in one particular volume; L. Frank Baum did this regularly, and Michael Moorcock frequently uses this device – particularly in his Eternal Champion series of novels, which establish a vast 'multiverse' populated by numerous different characters, many of whom appear in different novels and even different genres. Kim Newman is another author who frequently uses this device, as does Stephen King. The works of James Branch Cabell, J.D. Salinger, William Faulkner, Margaret Laurence, Thomas Pynchon, Kurt Vonnegut, Mordecai Richler, Edgar Rice Burroughs and Isaac Asimov also 'crossover' with each other, linking different characters and settings together over a number of different works.

Brazilian writer Monteiro Lobato also created solid and imaginative crossovers, using elements and characters from Brazilian folklore such as the Cuca and Saci, from Greek Mythology, from the Arabian Nights, from Fairy Tales such as Grimm's Snow White, western literature such as Peter Pan, cartoons such as Popeye and Felix the Cat, and western films.

Public domain[edit]

It is also common for authors to 'crossover' characters who have passed into the public domain, and thus do not require copyright or royalty payments for their use in other works; a prominent example of this occurs in Loren D. Estleman's novel Sherlock Holmes vs. Dracula, in which Sherlock Holmes and Dracula are brought together and pitted against each other. The League of Extraordinary Gentlemen by Alan Moore and Kevin O'Neill is another example of this, as all of the main characters and most of the secondary / background characters are fictional characters whose copyright has expired, and all are characters of different authors and creators brought together within one massive extended universe. Many of the works of Philip José Farmer's Wold Newton family sequences (which has also been explored and developed by other authors) also utilize and interweave numerous otherwise unrelated fictional characters into a rich family history by speculating familial connections between them (such as a blood-relationship between Sherlock Holmes and Tarzan). Roger Zelazny's novel A Night in the Lonesome October combines Sherlock Holmes, Doctor Frankenstein, Jack the Ripper and the Cthulhu Mythos, although he never specifically identifies them as such ("The Count", "The Good Doctor", "Jack", etc.).

Occasionally, authors will include into crossovers classic fictional characters whose copyright is still held by the original authors (or at least their estates), but who are nevertheless considered iconic or 'mythic' enough to be recognised from a few character traits or descriptions without being directly named (thus not requiring royalties payments to be made to the copyright holder). A prominent example occurs within The League of Extraordinary Gentlemen, Volume One, wherein a character who is clearly intended in appearance and description by other characters to be Dr. Fu Manchu appears as a significant villain; however, as this character was not in the public domain at the time of writing and the rights still held by the estate of his creator Sax Rohmer, he is not directly named as such in the work and is only referred to as 'the Devil Doctor'. Something similar occurs in The League of Extraordinary Gentlemen: Black Dossier, wherein a character named "Jimmy" is clearly intended to be Ian Fleming's character James Bond, though here he is satirized as being an inept and unfavorable antagonist, likely to parody Sean Connery's appearance in the 2003 film adaptation. Another example in The League of Extraordinary Gentlemen is when a character is named to be the Anti-Christ, yet, despite never being named, is shown to be an evil Harry Potter.

The TV show Once Upon a Time is set in a world in which all fairy tales coexist, including Snow White, Little Red Riding Hood, and even Alice in Wonderland. The Shrek film series is built on the same concept, and even includes references to then-copyrighted elements like Peter Pan.

Television series[edit]

Crossovers between established shows[edit]

Crossovers involving principals can also occur when the characters have no prior relationship, but are related by time period, locale or profession. For example, the Law and Order series afford a commonality of setting which lends itself to crossovers, and they are frequent within the Law & Order franchise.

Following the cancellation of the ABC soap opera One Life to Live and its high rated finale, several characters crossed over into the network's remaining soap opera General Hospital, remaining in the same timeline as their former show.

Between related shows[edit]

Though most common on shows of the same production company, crossovers have also occurred because shows share the same distributor or television network. A notable example of this kind of link is that between Murder, She Wrote and Magnum, P.I. These shows were made by different companies, but owned by Universal Studios and broadcast on CBS. Another case is that of Mad About You and Friends, which share the character of Ursula Buffay. Neither show shares any production or distribution commonality, but rather an actress (Lisa Kudrow), a setting (New York City) and a schedule (Friends initially followed Mad About You on NBC's Thursday night schedule).

Mad About You and Friends share another type of "network crossover." On rare occasions, networks have chosen to theme an entire night's programming around a crossover "event." In one case, a New York City blackout caused by Paul Reiser's character on Mad About You was experienced by the characters on Friends.[4] Such "event nights" can also be linked by a single character's quest across multiple shows on the same evening. ABC attempted this kind of "event night" crossover with its Friday night programming during the 1997 season. There, they proposed that the title character of Sabrina the Teenage Witch should chase her cat, Salem, through Boy Meets World, You Wish and Teen Angel because it had run away with a "time ball" that was displacing each show through time.[5]

Dan Schneider used the show he was producing Zoey 101 to promote his new show ICarly by making characters from Zoey 101 go to ICarly.com or use the song Leave It All To Me, the ICarly theme song as a ringtone.

Narrative rationales for crossovers[edit]

On other occasions, crossovers between established shows can occur without a network or production commonality, but simply because there is some narrative rationale for the crossover. The appearance of detective John Munch (from NBC's Homicide: Life on the Street) on Fox's The X-Files happened merely because the episode revolved around a crime scene in Baltimore, a logical place for characters on The X-Files to have encountered Munch. Munch would also appear on the TV series Law & Order on NBC in which it had one episode which began on that series in New York City and concluded in Baltimore on Homicide: Life on the Street. Later, when Homicide went off the air in 1999, Detective Munch ends up leaving Baltimore to move to New York, and becoming a permanent character (as New York City Detective Munch) on NBC's Law & Order: Special Victims Unit until October 2013.

A two-part crossover episode between CSI: Crime Scene Investigation with Without a Trace aired on November 8, 2007. The first hour was on CSI and the second hour was on Without a Trace.[6] While both series are on the same network in the United States, spreading two parts of a story across two different shows can cause problems in international markets where they have been separately sold to different broadcasters. For example, in the United Kingdom, Without a Trace was shown on Channel 4 and CSI on Channel 5, meaning the two companies had to come to a special agreement to show both episodes.[6] Another CSI crossover occurred in 2009 when Raymond Langston from CSI: Crime Scene Investigation appeared both in CSI: Miami[7] and CSI: NY,[8] traveling to Miami and New York to track a human trafficking and organ harvesting ring. ER had a crossover with Third Watch which corresponded with a peak in viewership for the latter show, with 17.2 million viewers.[9]

In 2013, the Canadian crime drama series Republic of Doyle and Murdoch Mysteries produced a crossover,[10] which was complicated by the shows' incompatible historical settings; Murdoch Mysteries is a historical series set in the 1890s, while Republic of Doyle is set in the present day. The problem was solved by having the actors cross over as relatives of their primary characters; Allan Hawco appeared on the November 25, 2013 episode of Murdoch Mysteries as Jacob Doyle, a 19th-century ancestor of his regular character Jake Doyle, while Yannick Bisson appeared on a January 2014 episode of Republic of Doyle as Bill Murdoch, a 21st-century descendant of his regular character William Murdoch.[10]

Crossovers in children's television[edit]

Disney Channel's Suite Life franchise has featured three crossovers: in 2007, That's So Suite Life of Hannah Montana featured characters from Hannah Montana and That's So Raven taking a vacation at the Tipton Hotel (the main setting of The Suite Life of Zack & Cody); Hannah Montana/Miley Stewart (Miley Cyrus) also eats cake off Zack, which recurs in the 2009 crossover Wizards on Deck with Hannah Montana, in which characters from Wizards of Waverly Place and Hannah Montana come on aboard the S.S. Tipton.

Another type of crossover involves characters from an off the air series resurfacing in a newer series. This occurred in a 2010 episode of the Nickelodeon sitcom iCarly; the episode "iStart a Fan War" featured recurring characters from two Nickelodeon series: Drake & Josh characters Eric Blonowitz, Craig Ramirez, Gavin Mitchell, and Zoey 101 character Stacey Dillsen. A crossover between Victorious and Drake & Josh also occurred, with Helen DuBois, portrayed by Yvette Nicole Brown making an appearance. An episode titled "iParty with Victorious" was a crossover between iCarly and Victorious. This means all four shows exist in the same universe.

The main characters of Aaahh!!! Real Monsters make a crossover appearance in the Rugrats episode, "Ghost Story". This is because both shows were created/produced by Klasky Csupo and distributed also by Nickelodeon[citation needed].

Special usages[edit]

Promotional cameos[edit]

Crossovers can take the form of a promotional cameo appearance, used to draw attention to another work of fiction, with little rational explanation in the context of the hosting show's narrative. When not clearly presented as parody, this is frequently scorned by fans as blatant commercialism. A notable example of this is The Simpsons episode A Star Is Burns, in which the character of Jay Sherman (from The Critic) appeared. This episode was largely condemned by fans of The Simpsons as existing to promote The Critic. Even Simpsons creator Matt Groening objected, preferring to remove his name from the credits of that particular episode in protest.[11]

The character Dan Tanna (played by Robert Urich) from the detective series Vega$ appeared in an episode of Charlie's Angels ("Angels in Vegas") one week prior to the debut of Vega$. However, it is not considered a spin-off because Dan Tanna was introduced in the pilot that was aired as an ABC TV Movie of the Week on the evening of Tuesday, April 25th 1978. The crossover was simply used to reintroduce the Dan Tanna character and to promote the debut of Vega$ as an ongoing series. Additionally, the cast of The Love Boat appeared in the fourth season premier of Charlie's Angels ("Love Boat Angels").

In 2010, as a nod to the 50th anniversary of Coronation Street, characters in fellow established TV soap EastEnders made reference to watching the special anniversary episode.[12] EastEnders had celebrated its own 25th anniversary earlier in the same year.

Spin-offs[edit]

In its simplest and most common form, a television crossover involves a starring character on a parent show appearing on a spin-off or vice versa because of established character relationships. An obvious example of this type of crossover occurred when Cliff Huxtable of The Cosby Show visited his daughter, Denise, on A Different World. Another example of this is The Bionic Woman, which was a spin-off from The Six Million Dollar Man. Jaime Sommers was a tennis pro who was nearly killed in a skydiving accident, but her life was saved by Oscar Goldman (Richard Anderson) and Dr. Rudy Wells (Martin E. Brooks) who surgically implanted her with bionic parts similar to those of Steve Austin. Steve Austin and Jaimie Sommers often crossovered, while the characters Oscar Goldman and Rudy Wells appeared regularly in both shows. Another example would be the appearances made by Buffy the Vampire Slayer characters to Angel in Los Angeles from Sunnydale.

More complex multi-production franchises can utilize crossovers of characters to serve as a device in establishing continuity in a shared fictional universe. This crossover is common in the Star Trek universe, where minor guest stars from one series have appeared as featured guest stars later ones. A good example of this crossover is that of the Klingons Kor (from the Original Series episode "Errand of Mercy"), Koloth (from "The Trouble With Tribbles") and Kang (from "Day of the Dove"). After the passage of about a century of narrative time, the three onetime adversaries of Captain Kirk appeared together in the Star Trek: Deep Space Nine episode, "Blood Oath" - as the Klingons and Federation had become allies in the century between, the former villains are now portrayed as heroes. Another Klingon, Arne Darvin, appeared as a secondary character in "The Trouble with Tribbles", but was the principal villain of DS9's "Trials and Tribble-ations". Intended as a celebration of the franchise's 30th anniversary, "Trials and Tribble-ations" was actually a crossover in and of itself; using then brand-new bluescreen techniques, the episode places the DS9 cast (after hijacking the Defiant, Darvin had gone back in time hoping to kill Kirk and become a hero to the Klingons, and it's up to Sisko and his comrades to stop Darvin and preserve the timeline) inside the TOS episode, interacting with Kirk, Spock and the rest of the Enterprise crew.

The distinction between "spin-off" and "crossover" is sometimes narrow. The two terms can become especially conflated if two shows are linked by a guest star with a single appearance. There is debate, for instance over whether Out of the Blue is a spin-off of Happy Days, or whether the star of Out of the Blue merely crossed over into Happy Days.

Parodic crossovers[edit]

Often, the problems of bringing together two shows with different narrative ambitions make the writing of a crossover burdensome. Such difficulties are encountered by situation comedies that wish to crossover with dramatic television programmes. The satirical crossover—ranging in length from a cameo to a full comedy sketch or episode—is an extremely popular way of circumventing this problem. By various means, such crossovers typically avoid outcry from fans by being obvious parody or homage. However, on rare occasion, the humor of such crossovers can be used by one show make a narrative point by capitalizing on the audience's experience of the other programme.

Such tongue-in-cheek crossovers typically fall into one of several broad categories.

  • Parodic crossovers can be directly established as being outside of the continuity of one or all of the properties being crossed over. A good example is the crossover between The Simpsons and The X-Files, which was largely accepted as being outside of standard X-Files continuity.
  • One episode of The Grim Adventures of Billy & Mandy shows that after Mandy smiles, she, along with Billy and Grim, are transformed into The Powerpuff Girls with a cameo by Professor Utonium.
  • They can occur by virtue of a dream sequence, in which the characters of one show will appear as part of a dream had by a character on another show. This method was perhaps used most famously to explain to audiences that the entirety of Newhart had been the dream of Bob Newhart's character on The Bob Newhart Show. It has more recently been used to demonstrate that cast members of The Young And The Restless appeared in a dream of a character onThe King of Queens.
  • Parodic crossovers can take the form of "gag" cameos by characters of one property appearing on another. Characters from King of the Hill have appeared on The Simpsons to comment on a peewee football game. Gag cameos may also include the appearance of an actor from another show, but not necessarily the character that the actor played. For instance, on the ABC/CBS show Family Matters during the closing credits of the episode "Scenes From a Mall" (Season 5, Episode 12), a scene which was shown earlier in the episode featuring Reginald VelJohnson is re-played, but this time with one of the child actors stating that he "looks like that fat guy from Fresh Prince," referring to James Avery who played Judge Phillip Banks on NBC's The Fresh Prince of Bel-Air. To the obvious surprise of the studio audience and VelJohnson, Avery walked onto the set with an angry look, being in on the staged joke himself. Ended the episode (but with the cameras filming still), VelJohnson and Avery hugged and smilingly greeted the public.
  • Crossovers of this type can also be completely wordless. This type of crossover is more common on animated programmes, such as when Bender found and ate Bart Simpson's shorts on Futurama, or Milhouse had a talking Bender doll on The Simpsons. This would seem to be another case when a popular franchise is acknowledged as fiction and not a crossover of the stories.
  • Perhaps the most obvious parodic crossover is found when characters from two series interact outside of either series. This occurs most commonly on a sketch comedy show or as a humorous interlude on an award telecast. Such crossovers may sometimes involve the real actors — for example, a sketch on Royal Canadian Air Farce saw Yasir and Sarah from Little Mosque on the Prairie buying the gas station from Corner Gas, with all characters in the sketch being portrayed by the shows' real actors — although they may also feature one genuine star from the show amid a cast comprised otherwise of the sketch show's own stable of actors. Such crossovers are generally immediately apparent as parodies to the audience — and in no way considered a part of either show's continuity — due to the need for the hosting show to approximate the sets and costumes of the satirized programmes quickly and inexpensively. When Patrick Stewart appeared in a Star Trek: The Next Generation/The Love Boat crossover on Saturday Night Live, for instance, few Star Trek fans would have been fooled by the visual design into believing the event "counted" as an episode of the show. However, there are some cases of this type of parody having some canonical resonance with viewers. For instance, the British charity appeal, Comic Relief often contains parodic crossovers of a technically higher quality than the typical sketch show. Many of these Relief sketches are produced by the cast and crew of the actual programmes being parodied, and hence appear to be "normal" episodes. A good example of this is the sketch, "BallyKissDibley", an 11-minute piece in which the leads of Ballykissangel appeared on the sets of The Vicar of Dibley, alongside most of Dibley's cast. Since the sketch derived its humor from all actors remaining in character, the extent to which these parodies "count" as part of either show's canon is more open to interpretation than most sketch crossovers.
  • Parodic crossovers can be used to lend verisimilitude to the fictional world of a programme. Characters from a fictional television series may appear on a stylized version of an established non-fictional television series, such as game shows or reality shows. These crossovers between celebrity hosts and fictional characters are quite common on situation comedies. Mama's Family once appeared on Family Feud and the townsfolk of The Vicar of Dibley have had their heirlooms valuated on Antiques Roadshow, for instance. In such cases, it is generally the non-fictional show which ends up being the most satirized, due to a need to compress the experience to its most recognizable elements. However, these crossovers can happen on dramatic television, such as when Blue Peter provided narrative exposition on The Sarah Jane Adventures. Rarely, brief crossovers between two fictional programmes can be used for this same purpose. In the episode, Army of Ghosts, Peggy Mitchell was seen in a fictionalized scene from EastEnders in order to demonstrate the degree to which the titular ghosts had permeated the popular culture of Doctor Who's Britain. Here, too, time constraints caused the satire of the guest programme (EastEnders) and not the host programme (Doctor Who).
Retroactive crossovers[edit]

Sometimes, crossovers occur even when there was no explicit intent to create them. Viewer interpretation can play into the size and complexity of crossovers. These sorts of crossovers involve no creation of additional material, but merely result from inferences drawn about existing filmed episodes. Usually they are a product of narrative ambiguity. Perhaps the best example of this was caused by the unusual ending to St. Elsewhere. One interpretation of the ending scene of the final episode has been that the entire run of the program was a figment of autistic character, Tommy Westphall's, imagination. This leads itself to a broad interpretation of the events of that series. Because the show had direct crossovers with twelve different programmes, and each one of these twelve had numerous other crossovers, linkages can be found from Elsewhere to 280 other shows, comprising what has been called "the Tommyverse".[citation needed]

Unofficial crossovers[edit]

In contrast with legal crossovers, unofficial crossovers are created solely because of the artistic pleasure derived by its producers. Generally, unofficial crossovers take the form of fan-written fiction and fan art, but it is increasingly prevalent in amateur films and audio. Whereas official crossovers are frequently stymied by such concerns as copyright, royalties payments, quality of writing and ownership of the characters, unofficial crossovers are unfettered by such concerns, so long as property holders do not exercise their right to enjoin the distribution of such material.

A good example would be the unauthorised live action fan film Batman: Dead End, which brings together the properties of Batman, Alien and Predator in one setting.

Unofficial crossovers can also occur in a "what-if" scenario. The most notable is an episode of Family Guy entitled "Lois Kills Stewie" which turned out to be a simulation along with the previous episode "Stewie Kills Lois". Stewie Griffin is confronted by Stan Smith and Avery Bullock from American Dad! while hacking into the central power grid at the CIA in a latest plan for world domination. Stewie mistakes Stan for Joe Swanson, due to notable similarities between the two shows. Stewie threatens to turn off all the electricity in the world until Stan and Bullock fulfill his demands of being "President of the World", which they do. Even though this never really happened, this is considered by some to mark the first official appearance of American Dad! characters in a Family Guy episode. Roger makes frequent cameo appearances in Family Guy, while Brian makes cameos on American Dad!. Roger, Rallo Tubbs, and Klaus Heissler were seen in the final Family Guy Star Wars spoof, "It's A Trap!", as an Imperial Officer, Nien Nunb, and Admiral Ackbar, respectively. Stewie also appears as an interactive hallucination of Booth on Bones when the agent has issues over possibly becoming a sperm donor, with David Boreanaz (who plays Booth) repaying the favor in Road to the North Pole.

Sherlock Holmes's War of the Worlds introduces the famous detective to the scene of London occupied by Martian invaders, as depicted by H. G. Wells, the crossover facilitated by the fact that both works, set in late Victorian London, are now in the public domain and can be freely used and modified.

Fan fiction crossovers between different science fiction movies and series are often created, such as Star Wars vs. Star Trek or Babylon 5 vs. Stargate. M.U.G.E.N. is a fighting game engine that features many fan-created and fictional characters and stages from various television series, movies, as well as other video games.

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