Homicidal is the cult 1961 'homage' to Alfred Hitchcock's Psycho from the man who pioneered such interactive theater-going staples as 'Percepto' and 'lllusion-O,' schlock meister William Castle (The Tingler, 13 Ghosts, House on Haunted Hill). A coldly attractive blonde named Emily (Jean Arless, Shampoo, The Great Sex War) checks into a swanky hotel and offers a handsome bellboy named Jim Nesbitt (Richard Rust, Walk on the Wild Side) $2,000 to marry her, assuring him that the marriage will be annulled immediately after the ceremony; Jim is clearly perplexed, but agrees. While they are standing before the justice of the peace (James Westerfield), Emily pulls out a knife and stabs the magistrate to death. She then dashes off to a spooky old mansion, where she terrorizes - and eventually murders - a wheelchair-ridden old woman named Helga (Eugenie Leontovich). It appears that our heroine is killing for no reason, but there definitely is a method to her madness.