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Casting

Director

Fred F. Sears

Producer

Charles H. Schneer

Executive Producer

Sam Katzman

Screenplay

George Worthing Yates, Bernard Gordon

Novel

Donald E. Keyhoe

Director of Photography

Fred Jackman Jr.

Editor

Danny B. Landres

Art Direction

Paul Palmentola

Set Decoration

Sidney Clifford

Hugh Marlowe
Hugh MarloweDr. Russell A. Marvin
Joan Taylor
Joan TaylorCarol Marvin
Donald Curtis
Donald CurtisMaj. Huglin
Morris Ankrum
Morris AnkrumBrig. Gen. John Hanley
Thomas Browne Henry
Thomas Browne HenryVice Adm. Enright
Grandon Rhodes
Grandon RhodesGen. Edmunds
John Zaremba
John ZarembaProf. Kanter
Paul Frees
Paul FreesAlien (voice)
Frank Wilcox
Frank WilcoxAlfred Cassidy
?
Sydney MasonFrank the garage man
Larry J. Blake
Larry J. BlakeMotorcycle cop
?
Bert StevensAir Intelligence Command Officer
Forbes Murray
Forbes MurrayMilitary Officer at Experiment
Arthur Tovey
Arthur ToveyOfficer/Civilian at Military Conference
?
Alan WellsMajor Kimberly
?
Nicky BlairMilitary Officer at Experiment (uncredited)
?
Jimmy CrossMilitary Messenger (uncredited)
?
Jack DeeryMilitary Officer (uncredited)
Charles Evans
Charles EvansDr. Alberts (uncredited)
?
Raoul FreemanMilitary Official (uncredited)
Paul Frees
Paul FreesAlien (voice) (uncredited)
?
James GonzalezMilitary Official (uncredited)
?
Duke GreenMinor Role (uncredited)
?
Ed HaskettMilitary Official (uncredited)
Clark Howat
Clark HowatSgt. Nash (uncredited)
Harry Lauter
Harry LauterCutting - Generator Technician (uncredited)
?
Don MarloweMinor Role (uncredited)
?
William MeaderWorker in Control Tower (uncredited)
Sol Murgi
Sol MurgiPlane Passenger (uncredited)
Forbes Murray
Forbes MurrayMilitary Officer at Experiment (uncredited)
?
William J. O'BrienRadio Listener (archive footage) (uncredited)
?
Murray PollackPlane Passenger (uncredited)
Mike Ragan
Mike RaganTank Commander (uncredited)
?
Alan ReynoldsMaj. Kimberly (uncredited)
Dale Van Sickel
Dale Van SickelMan Crushed Beneath Wall (uncredited)
?
Guy WayCivilian Observing Saucer Attack (uncredited)
?
Bob WhitneyPlane Passenger (uncredited)
Frank Wilcox
Frank WilcoxAlfred Cassidy (uncredited)
?
Beal WongChinese Radio Listener (uncredited)
William Woodson
William WoodsonNarrator (voice) (uncredited)