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- James Whitmore as Sgt. Ben Peterson
- Edmund Gwenn as Dr. Harold Medford
- Joan Weldon as Dr. Pat Medford
- James Arness as Agent Robert Graham
- Onslow Stevens as Gen. O'Brien
- Sean McClory as Maj. Kibbee
- Chris Drake as Trooper Ed Blackburn
- Mary Ann Hokanson as Mrs. Lodge
- Don Shelton as Capt. Fred Edwards
- Fess Parker as Alan Crotty
- Olin Howlin as Jensen
- Sandy Descher as Ellinson Girl
- Leonard Nimoy as Army Sergeant (uncredited)