Jack Arnold Director John Agar Dr. Matt Hastings Actor Mara Corday Stephanie "Steve" Clayton Actor Leo G. Carroll Gerald Deemer Actor Nestor Paiva Jack Andrews Actor Ross Elliott Joe Burch Actor Edwin Rand Lt. John Nolan Actor Raymond Bailey Townsend Actor Hank Patterson Josh Actor Bert Holland Barney Russell Actor Steve Darrell Andy Andersen Actor Eddie Parker Paul Lund, Eric Jacobs Actor Clint Eastwood Jet Squadron Leader Actor Jane Howard Coed Secretary Actor Billy Wayne Murphy Actor Dee Carroll Telephone Operator Actor James Hyland Trooper Grayson Actor Don Dillaway Jim Bagny Actor William Alland Producer Robert M. Fresco Screenwriter Martin Berkeley Screenwriter George Robinson Cinematographer William M. Morgan Film Editing Alexander Golitzen Art Director Alfred Sweeney Art Director Russell A. Gausman Set Decoration Ruby R. Levitt Set Decoration