A salvage vessel is nearly sunk off the Irish coast by an undersea earthquake. A few nights later, a walking sea monster tangles with the fishing boats and enters the town. The salvage vessel captures Gorgo and takes it to London for display. Gorgo's mother, who is upset and significantly larger follows his trail to London leaving a wake of destruction in her path.

Directed by: Eugene Lourie The cast includes: Bill Travers (Joe), William Sylvester (Sam), Vincent Winter (Sean), Christopher Rhodes (McCartin), Joseph O'Conor (Professor Hendricks), Bruce Seton (Professor Flaherty) MPAA rating: , Running time: 76 minutes Presented in: Color Related categories: Atomic SciFi, Monsters on the Loose, Undersea