While accompanying Professor Naska and his students on a field trip to Ancient Aztek ruins in Mexico El Dorado is attacked by Alien Invaders. When El Dorado scares them off an angered Alien Mummy attacks El Dorado and the others. Meanwhile at the Hall of Justice Superman and Wonder Woman receive a U.F.O. alert and head out to Mexico. When the two Super Friends arrive see The Alien Mummy has El Dorado and the others have been put under mind control. When Superman and Wonder Woman confront the