6.1

The biggest thing since creation!
Directed by Eugène Lourié
Marine atomic tests cause changes in the ocean's ecosystem resulting in dangerous blobs of radiation and the resurrection of a dormant dinosaur which threatens London.
Where to watch

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)