Gene Barry

Jonathan Clark

Valerie French

Eve Wingate

Jiří Voskovec

Prof. Klaus Bechner

Azemat Janti

Ivan Godofsky

Stefan Schnabel

The Soviet General

Friedrich von Ledebur

Dr. Karl Neuhaus

Ralph Clanton

Mr Ingram

Arnold Moss

The Alien

Monty Ash

Soviet Prison Physician

Theo Marcuse

Soviet Col. Gregor

Paul Birch

Admiral

Paul Frees

Radio Newscaster Ward Mason

Marie Tsien

Su Tan

Charles Bennett

Gorki

John Bleifer

Spokesman

Irvin Ashkenazy

2nd Man

David Bond

Dr. Schmidt

Philip Van Zandt

Taxi Driver

Mel Welles

Russian Marshal

Peter Norman

Interrogator

John Mantley

Screenplay

Henry Freulich

Director of Photography

Ross Bellah

Art Direction

William Asher

Director

Jerome Thoms

Editor

John Mantley

Novel

Frank Tuttle

Set Decoration

Lewis J. Rachmil

Executive Producer

Ray Harryhausen

Special Effects

Will Sheldon

Second Unit

Ferrol Redd

Sound Director

Mischa Bakaleinikoff

Original Music Composer

Helen Ainsworth

Producer

Romson Productions

Columbia Pictures

US