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A scientist discovers that he isn't an only child in this effects-laden creature feature whose cast includes screen veterans Kim Hunter and Rod Steiger among a host of other, less well-known performers. John Hollins (David Allen Brooks) is delighted to learn that his geneticist mother, Amanda (Hunter), has awoken from her coma years after she suffered a horrible car crash. During their reunion, he learns that she was trying to put an end to a misguided experiment at her home on the night of the accident. Before losing consciousness, Amanda reveals that John has a brother named Anthony. Later, she's murdered by Dr. Phillip Lloyd (Rod Steiger), an old colleague who wants to uncover the secrets of her research. John travels to his large, run-down boyhood home with his girlfriend, a group of pals, and a mysterious acolyte of his mother's named Melissa (Amanda Pays); the group plans to search for clues about Amanda's research and John's supposed sibling. The young scientist soon ascertains that his mother had created some sort of human/aquatic hybrid, but he doesn't realize that the creature was assembled from his own genetic material -- or that it's still alive in the bowels of the house and picking off his friends one at a time. Meanwhile, something's fishy with Melissa, who skulks around, doesn't sleep, tries to seduce John, covers up details of the attacks on his friends, and seems to have some sort of connection to Dr. Lloyd. Co-directors Jeffrey Obrow and Stephen W. Carpenter previously collaborated on the slasher quickie The Dorm That Dripped Blood and on The Power, a made-for-TV horror film. Pays would go on to co-star in the similarly aquatic sci-fi film Leviathan.