Steve Karnes

Gene Evans

Prof. James Bickford

Andre Morell

John

John Turner

Jean Trevethan

Leigh Madison

Tom Trevethan

Henry Vidon

Dr. C. A. Morris, the village doctor

Alastair Hunter

Dr. Sampson, the Paleontologist

Jack MacGowran

Tom Trevethan

Henri Vidon

Senior Admiral, at the Admiralty

Lloyd Lamble

Mini Submarine Officer

Maurice Kaufmann

Scientist

Leonard Sachs

Announcer

Neal Arden

Photo Lab Aide

Patrick Jordan

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

Howard Lang

Scientist at Conference (uncredited)

Ernest Blyth

Man Listening to Car Radio (uncredited)

Paul Beradi

PLA Radio Operator (uncredited)

Max Faulkner

Dr. Sampson's Helicopter Pilot (uncredited)

Neil Hallett

French Radio Officer (uncredited)

André Maranne

The Radar Operator, at the radar room (uncredited)

Derren Nesbitt

Naval Officer in Situation Room (uncredited)

Guy Standeven