To experience the grisly goings'on of Wicked. Wicked, your right eye has to know what your left eye is doing! Filmed in a split-screen process dubbed Duo-vision. this guilty pleasure follows a psycho electrician at an elegant California resort who prefers blondes,.,dismembered. It simultaneously follows, on the other half of the screen, the gorgeous, golden-haired guests who are unaware they'll soon be checking out. More horror chops: the bloody mayhem is set to the organ music created for the 1925 silent classic Phantom of the Opera. "Twice the tension! Twice the terror!" screamed the movie's poster art. Wicked!