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
My Little Pony: Friendship Is Magic with
Doctor Who, two franchises with
very different atmospheres, in a single piece of artwork.
note Though, to be fair, the Doctor stand-in actually appears in the former show.
The resulting crossover may be
art or
fiction. It may be a delightful surprise, like finding out how well chocolate and peanut butter go together, or it may turn your stomach, like finding out
how well waffles, pickles, and lemons go together.
This can apply to a
Common Crossover,
Mega Crossover, or even a
Massive Multiplayer Crossover, but not a
Crisis Crossover, which features characters from the same universe.
Note that
Rule 34 refers to prurient versions of single franchises, while
Crossover Ship refers to romantic crossovers only.
