Gorilla Grodd attempts to take over Gorilla City (a society of super-intelligent gorillas of which he is one) with a mind-altering vapor that induces fear in its inhabitants. However, King Solovar has protected himself from the vapor and has Grodd banished as he was before for attempting to overthrow him. Brainiac has created a brain-wave amplifier to control anyone in a 100-mile radius. Grodd convinces him to use it to take over Gorilla City. Solovar escapes before its activation and asks the Super Friends for their aid in stopping the Legion of Doom, who now control all the inhabitants of Gorilla City and wreak havoc upon an unsuspecting Africa.
