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Dr. Russell A. Marvin

Joan Taylor

Carol Marvin

Donald Curtis

Maj. Huglin

Morris Ankrum

Brig. Gen. John Hanley

Thomas Browne Henry

Vice Adm. Enright

Grandon Rhodes

Gen. Edmunds

John Zaremba

Prof. Kanter

Paul Frees

Alien (voice)

Frank Wilcox

Alfred Cassidy

Sydney Mason

Frank the garage man

Larry J. Blake

Motorcycle cop

Bert Stevens

Air Intelligence Command Officer

Forbes Murray

Military Officer at Experiment

Arthur Tovey

Officer/Civilian at Military Conference

Alan Wells

Major Kimberly

Nicky Blair

Military Officer at Experiment (uncredited)

Jimmy Cross

Military Messenger (uncredited)

Jack Deery

Military Officer (uncredited)

Charles Evans

Dr. Alberts (uncredited)

Raoul Freeman

Military Official (uncredited)