The Gamma Mu Mu fraternity (or simply the Gammas for short) is the college fraternity led by Bradley Uppercrust III, the primary antagonist in the 2000 Disney animated film, An Extremely Goofy Movie. The Gammas are the five-time reigning champions of the College X-Games, a title they have continued to hold onto through cunning yet clandestine methods of cheating and sabotage. Their largest member, Tank, originally served as Bradley's right-hand-man, but by the film's end, he kicks Bradley out of the Gammas after Max and Goofy save him from a fire inside which Bradley had left Tank behind.
They won the X-Games for years, but they cheated last year. As popular as they were, they were an arrogant bunch willing to sacrifice anything for solid victory.
- One of the few named Gammas besides Bradley and Tank was Slouch (the one with the hat) who, despite not being more important than the other Gammas, had to be mentioned as part of their sports' team. Slouch also got a figure in the McDonald's collection based on the film.
- A tall and skinny member of the Gammas looks like a shaved version of Bigfoot from the previous film, due to having the same snout. A conspiracy theory that they're the same character, but Disney likely just wanted to recycle a preexisting design.