- Unknown:
- Paul Christian
- Unknown:
- Cecil Kellaway
- Unknown:
- Paula Raymond
- Play By:
- Lou Morheim
- Unknown:
- Fred Freiberger
- Produced By:
- Hal Chester
- Produced By:
- Jack Dietz
- Directed By:
- Eugene Lourie
- Unknown:
- Stuart Whitman
- Unknown:
- Janet Leigh
- Unknown:
- Rory Calhoun
- Unknown:
- Gerry Bennett
- Unknown:
- Stuart Whitman
- Unknown:
- Janet Leigh
- Unknown:
- Don Holliday
- Unknown:
- Gene R. Kearney
- Unknown:
- Russell Braddon
- Produced By:
- A. C. Lyles
- Directed By:
- William F. Claxton
- Tom Nesbitt:
- Paul Christian
- Lee Hunter:
- Paula Raymond
- Prof Elson:
- Cecil Kellaway
- Col Evans:
- Kenneth Tobey
- Jacob:
- Jack Pennick
- Capt Jackson:
- Donald Woods
- Corp Stone:
- Lee van Cleef
- Sgt Loomis:
- Steve Brodie
- George Ritchie:
- Ross Elliott
- Sgt Willistead:
- Ray Hyke
- Nesbitt's secretary:
- Mary Hill
- Doctor:
- Michael Fox
- First radar man:
- Alvin Greenman
- Dr Morton:
- Frank Ferguson
- Dr Ingersoll:
- King Donovan
- Roy Bennett:
- Stuart Whitman
- Gerry Bennett:
- Janet Leigh
- Cole Hillman:
- Rory Calhoun
- Elgin Clark:
- de Forest Kelley
- Sheriff Cody:
- Paul Fix
- Amanda Bennett:
- Melanie Fullerton
- Jackie Hillman:
- Chris Morrell
- Jud:
- Chuck Hayward
- Frank:
- Henry Wills
- Mildred:
- Francesca Jarvis
- Dr Leopold:
- William Elliott
- Professor Dirkson:
- Robert Hardy
- Deputy Jason:
- Richard Jacome
- Housekeeper:
- Inez Periz
- Walker:
- G Leroy Gainter
- Major White:
- Evans Thornton