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.

Top Cast

Gene EvansSteve Karnes

André MorellProf. James Bickford

Leigh MadisonJean Trevethan

John TurnerJohn

Alastair HunterDr. C. A. Morris, the village doctor

Lloyd LambleSenior Admiral, at the Admiralty

Jack MacGowranDr. Sampson, the paleontologist

Maurice KaufmannMini Submarine Officer