Ciak si muore

A disgruntled actor fired from the set of a horror film begins killing various members of the cast and crew, at one point merely wounding one by bashing her head into the bathtub knobs, then sneaking into the hospital to disconnect her life-support machine. There's a chase through the city sewer system, and the film's conclusion finds the entire cast and the killer wearing superhero costumes for a scene shot inside an abandoned theater. Giorgio Ardisson leads the cast as the dedicated Inspector Menzies, supported by Annabella Incontrera, Ivano Staccioli, and Antonio Pierfederici. Co-writer Roberto Mauri (Le Notti di Violenza) directed the peculiar Madeleine, Anatomia di un Incubo the same year.