Crossovers have been used across all forms of media, characters from two separate fictional universes coming together for some reason or another. Comic books do it all the time, with heroes from one publisher's roster battling or aiding the characters of another, and video games have also dabbled in the practice, with Soul Calibur featuring characters such as Link, Heihachi, Darth Vader and Yoda over its various incarnations.
Xbox 360