The Giant Behemoth

Gene Evans Steve Karnes

André Morell Prof. James Bickford

Leigh Madison Jean Trevethan

John Turner John

Alastair Hunter Dr. C. A. Morris, the village doctor

Lloyd Lamble Senior Admiral, at the Admiralty

Jack MacGowran Dr. Sampson, the paleontologist

Maurice Kaufmann Mini Submarine Officer

Henri Vidon Tom Trevethan

Patrick Jordan Photo Lab Aide

Howard Lang Naval Commader, at the "Valkyrie" wreck (uncredited)

Leonard Sachs Dialogue Scientist at Conference (bit)

Ernest Blyth Scientist at Conference (uncredited)

Neal Arden TV Newscaster (uncredited)

Paul Beradi Man Listening to Car Radio (uncredited)

Max Faulkner PLA Radio Operator (uncredited)

Neil Hallett Dr. Sampson's Helicopter Pilot (uncredited)

André Maranne French Radio Officer (uncredited)

Derren Nesbitt The Radar Operator, at the radar room (uncredited)

Guy Standeven Naval Officer in Situation Room (uncredited)