Secret Origins of the Superfriends

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

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S03E17 - The Anti-Matter Monster