 The first part (or in some versions, the third part) of this  anthology horror film, "Case Of Harry Billings" starring  Richard Moll (qv), was edited from an unfinished, unreleased  horror film, "Scream Your Head Off" (although copies of it are  reported to be available). That film was written by  Philip Yordan (qv) and directed by John Carr (IV) (qv) (both  were also credited as the writer and director of this film).