Three aliens arrive on Earth after it has been destroyed. One of them proposes that it was a natural disaster; but the oldest and wisest of the three knows that the disaster was man-made. The three of them head to the ruined Hall of Justice, where they find memory tapes that show them how Lex Luthor came to be evil, how Apache Chief and Giganta gained their powers, and how the Justice League (SuperFriends) and the Legion of Doom came to be formed. They watch battles between the two groups. Most important, they learn how the Earth came to be destroyed.
—J. Spurlin