The "Legion of Doom" is a fictional group of supervillains appearing in various comic books published by DC Comics. They are often portrayed as adversaries to the Justice League, a team of superheroes. The group typically includes well-known villains like Lex Luthor, Gorilla Grodd, and Cheetah, who unite to achieve their nefarious goals. The Legion of Doom first gained popularity in the 1970s through the animated series Super Friends. In this series, they operated from a secret headquarters shaped like a skull, plotting against the heroes. Over the years, the Legion has appeared in various media, including comics, animated shows, and video games.