Dr. David Marrow invites three distinct individuals to the eerie and isolated Hill House to be subjects for a sleep disorder study. The unfortunate guests discover that Marrow is far more interested in the sinister mansion itself — and they soon see the true nature of its horror.
As a child living in Africa, Jill Young saw her mother killed while protecting wild gorillas from poachers led by Andrei Strasser. Now an adult, Jill cares for an orphaned gorilla named Joe -- who, due to a genetic anomaly, is 15 feet tall. When Gregg O'Hara arrives from California and sees the animal, he convinces Jill that Joe would be safest at his wildlife refuge. But Strasser follows them to the U.S., intent on capturing Joe for himself.