Champions was a superhero role-playing game by Hero Games. The first three editions were standalone games using the Hero System. The fourth edition was renamed Hero System and Champions became a campaign setting sourcebook. Champions continues to be used as the superhero genre sourcebook for fifth and sixth edition Hero System.
Champions: The New Millenium used a version of the Fuzion system.
Champions Complete for sixth edition is "Everything you need, in one book," as it was in first through fourth editions.
Champions Now is a re-imagining of first-through-third edition Champions by Ron Edwards.