John Carradine

Cosmic Man

Bruce Bennett

Dr. Karl Sorenson

Angela Greene

Kathy Grant

Paul Langton

Col. Matthews

Scotty Morrow

Ken Grant

Lyn Osborn

Sgt. Gray

Walter Maslow

Dr. "Rich" Richie

Herbert Lytton

Gen. Knowland

Ken Clayton

Master Sergeant

Harry Fleer

Bill, the Park Ranger

John Erman

Radar Operator

Dwight Brooks

Major

Hal Torey

Dr. Steinholtz

Alan Wells

Sergeant

Herbert S. Greene