- Rod Taylor as H. George Wells
- Alan Young as David Filby/James Filby
- Yvette Mimieux as Weena
- Sebastian Cabot as Dr. Philip Hillyer
- Tom Helmore as Anthony Bridewell
- Whit Bissell as Walter Kemp
- Doris Lloyd as Mrs. Watchett
- Paul Frees as voice of the Rings (uncredited)
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