A high school biology class receives a visitor, who is a good friend of their teacher. He tells them of an encounter that he and their teacher had 15 years before while searching for Indian artifacts in the nearby mountains. They find a mummified corpse in a cave that resembles a rough-hewn statue. The mummy is brought back to their lodge and breaks out of its wrappings. It goes on a rampage and the teens are forced to work together to stop the creature.
The film is an expanded version of a 1958 unreleased film titled TEENAGERS BATTLE THE THING.