The Incredible 2-Headed Transplant

In a twisted bid to prove his groundbreaking technique, Dr. Roger Girard transplants the head of a recently escaped psycho-killer onto that of Danny, a severely brain-damaged man trapped in a child's mind, resulting in a monstrous creature with two distinct heads: one driven by pure malevolence and the other with the innocence of an eight-year-old child, set to wreak havoc on its captors.