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[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/rsz_doctor_whooves_2230.jpg]]
[[caption-width-right:350:"[[Series/DoctorWho Timey-wimey]] [[WesternAnimation/MyLittlePonyFriendshipIsMagic pony stuff]]!"]]

[[RulesOfTheInternet Internet Rule]] 50: Every franchise will eventually have a {{crossover}} with every other franchise in some form. In other words, if it hasn't happened yet, someone's probably working on it now.

This trope includes any type of contact between franchises, whether it be physical or merely conceptual. See the image, which combines ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' with ''Series/DoctorWho'', two franchises with ''very'' different atmospheres, in a single piece of artwork.

The resulting crossover may be [[{{Fanart}} art]] or [[{{Fanfiction}} fiction]]. It may be a delightful surprise, like finding out how well chocolate and peanut butter go together, or it may turn your stomach.

This can apply to a CommonCrossover, MegaCrossover, or even a MassiveMultiplayerCrossover but not a CrisisCrossover which features characters from the same universe.

Note that {{Rule 34}} refers to prurient versions of single franchises, while CrossoverShip refers to romantic crossovers only.

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