The Legion of Doom is a team of super-villains and enemies to the Super Friends. They plan evil schemes from their swampy base in the Hall of Doom. There have also been several versions of this team in the DC Comics universe. Brainwave created a Legion of Doom to fight Extreme Justice and Superboy-Prime assembled one to fight the Teen Titans.
The Legion of Doom was created by Jeffrey Scott, first appearing in Challenge of the Super Friends episode Wanted: The Super Friends. (1978)