Secret Origins of the Super Friends - S3.E16

Lex Luthor has discovered the origins of Superman, Wonder Woman and Green Lantern. He proposes for the Legion of Doom to travel back in time and prevent them from existing. The Cheetah cheats in a tournament and becomes Wonder Woman. Lex Luthor becomes Green Lantern. The Legion of Doom alter baby Kal-El's spaceship away from Earth. However, after taking the other more obscure Super Friends prisoner, Batman, Robin, the Flash, and Black Vulcan find a tape of the plan that was carried out and uses the Justice League computer to find gaps in its memory, confirming that history was altered. They travel back in time, rectify Luthor's meddling and gain back their teammates.