became popular among children who watched the Saturday morning show. It is also notable for introducing a young Jan-Michael Vincent to TV viewers, as well as for being one of the early directorial efforts of Richard Donner, who went on to direct such popular feature films as Lethal Weapon and Superman II. The story concerns Professor Hayden, his daughter, and his young assistant (Vincent). They are searching for the lost ancient city of Tobanya -- as well as for the professor's missing ...