Following an accident, Jeremy Spensser's brain is transplanted by his scientist father into the huge body of an unattractive, frightening cyborg, this to save his brilliant son's mind so it can continue to serve mankind. As Jeremy's mind loses control over his mechanical body, other unexplained powers suddenly emerge from the strictly mechanical body, including mind control of humans and a death ray emanating from both its eyes.Finally, Jeremy's out-of-control body goes on a rampage in the United Nations building, killing several people. Only when Jeremy's young son confronts the cyborg is Jeremy able to restore his self-control long enough to tell the boy how to switch off and destroy the body of the "colossus."
