Rod Taylor

H. George Wells

Alan Young

David Filby / James Filby

Yvette Mimieux

Weena

Sebastian Cabot

Dr. Philip Hilyer

Tom Helmore

Anthony Bridewell

Whit Bissell

Walter Kemp

Doris Lloyd

Mrs. Watchett

Bob Barran

Eloi Man (uncredited)

Paul Frees

Talking Rings (voice) (uncredited)