This ridiculous '70s exploitation quickie is notable mainly for its casting: Bruce Dern toplines as the crazed doctor Girard, with Munsters star Pat Priest as his beleaguered wife and top-40 DJ Casey Kasem (who also lends his talents to various voice-overs throughout the film) as a medical colleague. Girard's semi-successful attempts at surgically attaching additional heads to various lab animals leaves him a bit unfulfilled, and it's no time at all before he goes about performing the operation on a human being. He chooses as his first subject his caretaker's simple-minded but kindly son Danny (John Bloom), onto whose massive shoulders he adds the head of a demented killer (Albert Cole) who was recently gunned down while trying to invade Girard's home. The result is less frightening than pitiful as the morose Danny's personality is subjugated to the evil will of his unwelcome new head, whose psychotic rage continues unabated in his hulking new physique. Shoddy effects, a cheesy (and horribly miscued) psychedelic score and laughably bad dialogue have ingratiated this film to many bad-movie buffs' top-ten lists.