Roy, an accident-prone blind man, falls in love with a young woman named Shirley. When Shirley’s overbearing father Frank lets his disapproval of their relationship be known, Roy and Shirley head off to Niagara Falls to open a restaurant as Frank plans to break them up.

When drillers on an offshore oil rig dredge up several prehistoric eggs, one man is attacked by what appears to be an unidentified deep-sea creature protecting them. Soon, strange symptoms and behaviors become apparent among the crew and one of the creatures grows to adult-size.