In contrast with legal crossovers, unofficial crossovers are created solely because of the artistic pleasure derived by their creators. 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. Others are absurd or simply impossible within the fictional setting, and have to be ignored by the series' respective continuities. Some crossovers are not explained at all. They may also involve using characters that have passed into the public domain with those concurrently under copyright protection.ДЄ crossover story may try to explain its own reason for the crossover, such as characters being neighbors (notable examples being the casts from The Golden Girls and Empty Nest) or meeting via dimensional rift or similar phenomenon (a common explanation for science fiction properties that have different owners). In other cases, the crossover can serve to introduce a new concept derivative of an older one.Д¬rossovers 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. Official and unofficial crossovers Official Д¬rossovers 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.

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