"Terror is about to surface!"
A marine biologist and a government agent investigate mysterious deaths and rumors of a sea monster in a secluded ocean cove, and find themselves involved with a marine biology professor conducting secretive experiments, international spies trying to steal his secrets, a radioactive light on the sea bottom, and the malevolent thing which guards it.
Dr. Ted Stevens, alias Ted Baxter

Lois King

Prof. King

William S. 'Bill' Grant
George Thomas

Ethel Hall

Wanda

Andy, the Janitor

Sheriff
The Phantom