John Robinson and Don West are transported onto a strange new world where their evil opposites exist and plan to change places with them. Will, the Robot and a reluctant Dr. Smith set out to find and help the real Don and John only to be pursued by an evil John Robinson.
Stars: Guy Williams, June Lockhart, Mark Goddard
Director(s): Sutton Roley
Writer(s): K.C. Alison, Irwin Allen