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 small town. Fishermen from England catch the "60 foot tall deep-sea creature." The monster is taken to London for a Circus and with great shock, they find out tat the creature is really just a baby. The creature's mother, who is upset and drastically larger, follows his trail to London, leaving a wake of destruction in her path.

The special effects of Gorgo, provided by Tom Howard - two time Academy Award winner, are truly admirable. The monsters are quite ferocious - except when they wiggle their ears.