Jeff Morrow as Mitchell 'Mitch' MacAfee

Mara Corday as Sally Caldwell

Morris Ankrum as Lt. Gen. Edward Considine

Louis Merrill as Pierre Broussard

Edgar Barrier as Dr. Karol Noymann

Robert Shayne as Gen. Van Buskirk

Frank Griffin as Pete - Pilot

Clark Howat as Maj. Bergen

Morgan Jones as Lieutenant, Radar Officer

Benjie Bancroft as Civil Aeronautics Board Member (uncredited)

Brad Brown as Pool Party Diver (uncredited)

Al Cantor as AF Projectionist (uncredited)

George Cisar as Admonishing Man on Airliner (uncredited)

Bud Cokes as Civil Aeronautics Board Member (uncredited)

Leonard P. Geer as Paramedic (uncredited)

Dabbs Greer as Fighter Pilot, (archive footage) (uncredited)

Sol Murgi as Civil Aeronautics Board Member (uncredited)

Fred F. Sears as Narrator (voice) (uncredited)

Robert B. Williams as First State Trooper (uncredited)