Synopsis by Hal Erickson
The Adventures of Superman switches from black and white to color in this first episode of the series' fourth season. Just as a crook named Turk (Jim Hyland) has shown up in the office of "Daily Planet" editor Perry White (John Hamilton) to sign a confession, in bursts eccentric scientist Professor Twiddle (Sterling Holloway) who announces that he has invented a time machine. In an instant, the invention has hurled White, Turk, Twiddle and reporters Clark (George Reeves), Lois (Noel Neill) and Jimmy (Jack Larson) back in time some 50,000 years to the Stone Age. There's just one small hitch: Twiddle hasn't invented a device to return the time travelers back to the Present!