The Duke: Cast Rate: –☹️ Very Bad🙁 Bad😐 Average🙂 Good😃 Excellent🤩 Super! ★ Save Rating✔ Rating Saved! Notify me: –about new episodeabout new seasonabout end of season Subscribe✔ Subscription Saved! The Duke Drama, Crime, Action 4/5/79 – 5/18/79 NBC United States GeneralEpisodesCastCharactersGallery Cast See full cast → Robert Conrad as Oscar "Duke" Ramsey Robert Conrad as Oscar "Duke" Ramsey Larry Manetti as Joe Cadillac Larry Manetti as Joe Cadillac Red West as Sgt. Mick O'Brien Red West as Sgt. Mick O'Brien Patricia Conwell as Dedra Smith