A fictional crossover occurs when two or more otherwise separated fictional characters, stories, settings, universes, or media meet and interact with each other. Most fictional crossovers take the form of stories in which these separated characters and others are brought together and united with (or pitted against) each other over the course of the story that is being told. Official fictional crossovers usually occur between characters owned by the same person, company or production team (such as most comic book crossovers) or through the incorporation of characters and fictional universes within the public domain (or those that are at least considered to be; examples include Sherlock Holmes, Dracula, or other classical characters), as the crossing over of characters owned by different people or production companies usually raises complicated issues over copyright, ownership and royalties. Many crossovers generally take the form of a marketing tool, a joke or gag, or to play out a "what if" scenario.
There are a number of different reasons for fictional crossovers to occur:
A crossover story may try to explain its own reason for the crossover, such as "they live next door" (one example being the casts from Golden Girls and Empty Nest) or "a dimensional rift brought them together" (a common explanation for superhero/science fiction properties that have different owners). Some crossovers are not explained at all. Some are absurd or simply impossible within the fictional setting, and have to be ignored by the series' respective continuities. Some even intentionally make the relations between two or more fictional universes confusing (a good example of this phenomenon involves The Simpsons and Futurama, where each show is fiction in the other.)
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 or DC comic books frequently interact with one another since they live in the same "universe". For example, in the Marvel Comics universe, the X-Men have frequent dealings with another group of Marvel heroes, the Fantastic Four, just as in the DC Comics Universe, Batman and Superman frequently 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 effecting (almost) all the stories in the shared universe.
In literature, certain authors also engage in crossovers by including characters from different novels they have written in one particular volume; Michael Moorcock frequently uses this device - particularly in his Eternal Champion sequence 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.
It is also common for authors to incorporate characters who have passed into the public domain, or at least are considered to have passed, and thus do not require copyright or royalty payments for their use into their works; perhaps the classic example of this occurs in Loren D. Estleman's novel Sherlock Holmes vs Dracula, in which the classic fictional characters of 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 (or least, are so famous that they have largely entered 'mythic' status), and all are characters of different authors and creators brought together within one massive extended universe.
It is less common to see crossovers of this nature on television programs, even those broadcast on the same network, as many television programs are produced by a number of different companies, which can result in complications over rights and authorship. Nevertheless, whilst spin-off programs are not themselves crossovers, it is common for spin-off television programs made by the same production company to still frequently interact with each other, in order to create a sense of a unified universe between the two. This is the case between the following television shows:
While not classified as spin-offs, That's So Raven, The Suite Life of Zack and Cody, and Hannah Montana were crossed over on July 28, 2006 in an hour-and-a-half-long episode entitled "That's So Suite Life of Hannah Montana" in Disney Channel's first crossover event. Despite the fact that all three shows share many of the same producers and creators, there were many unavoidable continuity errors (unavoidable because most of the main actors at one time guest-starred on each other's shows playing different roles).
Crossovers between characters / universes of a single author / production company may also be take the form of a guest or cameo appearance, often to promote another work of fiction, sometimes with little contextual or rational explanation. This is frequently scorned by fans of either as being purely for marketing reasons, with little point to the characters appearing or development within the story. A notable example of this is The Simpsons episode 'A Star is Burns', in which the character of Jay Sherman (from The Critic, a show developed by two writers and producers of The Simpsons and also broadcast on the Fox network) appeared. This episode was largely condemned by fans of The Simpsons as existing largely to promote The Critic, and even Simpsons creator Matt Groening objected, preferring to remove his name from the credits of that particular episode in protest.
Crossovers between the characters or universes of two different authors or production teams are significantly rarer, as copyright matters and ownership is a significant barrier and frequently impedes crossovers. Crossovers of this nature are more likely to occur between:
Significant exceptions where this has nevertheless occurred include:
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