Three aliens come to a ruined Earth. Travelling to the Great Hall of Justice, they find a series of memory tapes chronicling the Superfriends and the Legion of Doom. Although they find some origin tapes, they find nothing on the calamity that destroyed the Earth. They find the Legion of Doom HQ and discover that Luthor unleashed a solar flare that interacted with the Superfriends' planet-protecting shield, devastating all life on Earth. The aliens go back in time and alter the timeline with an eclipse so that the flare never makes it to Earth.
Challenge of the Super Friends is an American animated television series about a team of superheroes which ran from September 9, 1978, to December 23, 1978, on ABC. The complete series was produced by Hanna-Barbera Productions for Warner Bros. Television and is based on the Justice League and associated comic book characters published by DC Comics and created by Julius Schwartz, Gardner Fox and Mike Sekowsky. It was the third series of Super Friends cartoons, following the original Super Friends in 1973 and The All-New Super Friends Hour in 1977. It continues to air on Boomerang in the United States.
