Metro Goldwyn Mayer ; directed by Richard Fleischer ; produced by Jerry Bresler ; screenplay by Calder Willingham ; adaptation by Dale Wasserman ; a Kirk Douglas production ; a United Artists release ; Brynaprod S.A
United Artists presents a film produced by Alberto Grimaldi ; screenplay by Age [Agenore Incrocci], Scarpelli [Furio Scarpelli], Luciano Vincenzoni and Sergio Leone ; English version by Mickey Knox ; directed by Sergio Leone