A curse borne of torture and isolation comes to life and terrorizes a group of scientists who travel to the Alcatraz Prison to investigate a series of unsolved murders. The very last film ever to be shot on The Rock, prepare to experience the terror yourself inside the prison's haunted and deadly walls!

A parasitic alien soul is injected into the body of Melanie Stryder. Instead of carrying out her race's mission of taking over the Earth, "Wanda" (as she comes to be called) forms a bond with her host and sets out to aid other free humans.