Jerome Epstein Director, Screenwriter, Producer Milo O'Shea Mr. Zero Actor Phyllis Diller Mrs. Zero Actor Billie Whitelaw Daisy Devore Actor Sydney Chaplin Lieutenant Charles Actor Julian Glover Shrdlu Actor Raymond Huntley Smithers Actor Phil Brown Don Actor Paddie O'Neil Mabel Actor Libby Morris Ethel Actor Hugh McDermott Harry Actor Bill Nagy Lawyer Actor Carol Cleveland Judy Actor Walter Lassally Cinematographer Gerry Hambling Film Editing Mike Leander Original Music Lambert Williamson Original Music