Behemoth, the Sea Monster

Gene Evans Steve Karnes

Андре Морелл 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)