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.

An atomic bomb test in the Arctic Circle unfreezes a hibernating fictional dinosaur, a Rhedosaurus, that begins to wreak havoc in New York City.

When an undersea volcano sends tremors throughout the Atlantic, aquatic creatures come out of hiding. Merchant seamen Joe Ryan and partner Sam Slade harness the most unusual of the lot,…