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.

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.