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Three aliens visit a future Earth and after reviewing historical records, find that it's been inadvertently decimated by the Legion of Doom.
Batman is dead, and the Legion plan to kill the rest of the SuperFriends the same way.
To everyone's surprise, including the SuperFriends, the Legion of Doom becomes the Legion of Good! But it's a distraction while they conquer the Earth of 3984. However, the SuperFriends put together the Riddler's cryptic clues and Superman, Flash, and Green Lantern travel to the future to defeat them there.
The Legion of Doom carry out a plan to alter the past lives of Superman, Wonder Woman, and Green Lantern to prevent them from becoming superheroes. With this advantage, the villains are able to overpower the remaining SuperFriends. But when a few of them learn of the Legion's plot, they journey back to restore the correct timeline, insuring they become the heroes they are destined to be.moreless
The Legion of Doom schemes to trick the SuperFriends into recovering the Monolith of Evil for them.