Mr. Sardonicus is a horror film from the year 1961. It was directed by William Castle and stars Guy Rolfe as the eponymous Sardonicus. It was based on the short story Sardonicus by Ray Russell. Set in the year 1880, the film follows Sir Robert Cargrave, a renowned surgeon who specialises in paralysis, who receives a letter from his past love Maude and is invited to the mansion of her husband, Baron Sardonicus, in the fictional country of Gorslava.