In the film, she is portrayed by Eileen Brennan and is depicted as the wife of a U.S. Senator who is accused of taking bribes. In the film's second ending, or Ending B, she kills Mr. Boddy, Yvette, her former cook who became Mr. Boddy's cook, as well as a passing motorist, cop, and singing telegram girl to prevent her secrets from being exposed as she was taking bribes from foreign powers. While the others discover her crimes, Mrs. Peacock attempts to escape, only to be arrested on her way out. In Ending C, she only kills the cook before she is exposed and arrested.