Jerome Courtland

A wealthy Australian ranch owner's gift of a wild pony means young Scotty can finally ride the seven miles to and from school. But the pony gets away and is sheltered as unclaimed by a young girl who cannot walk. The treasured pony means freedom to both children, but can only belong to one.

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.