Rod Taylor character H. George Wells
Alan Young character David Filby / James Filby
Yvette Mimieux character Weena
Sebastian Cabot character Dr. Philip Hilyer
Tom Helmore character Anthony Bridewell
Whit Bissell character Walter Kemp
Doris Lloyd character Mrs. Watchett
Bob Barran character Eloi Man (uncredited)
Paul Frees character Talking Rings (voice) (uncredited)
