Tia and Tony are teenage sister and brother who possess extraordinary powers. They leave their safe refuge on Witch Mountain for a trip to Los Angeles. There, Tony is kidnapped by the evil Dr. Gannon and his spinster partner Letha. Tony is brainwashed into helping Gannon and Letha commit various crimes. It's up to Tia and a gang of juvenile delinquents to rescue Tony and prevent a major disaster.

Title from container. Based on the characters created by Alexander Key. Originally released as a motion picture in 1978. Special features: Pop-up fun facts.