Shock Treatment is a 1981 American musical comedy film directed by Jim Sharman, and co-written by Sharman and Richard O'Brien. It is a follow-up to the 1975 film The Rocky Horror Picture Show. While not an outright sequel, the film does feature characters from the previous film, most portrayed by different actors, as well as several Rocky Horror actors in new roles. The film stars Jessica Harper as Janet and Cliff DeYoung in a dual role as Brad and the film's main antagonist Farley Flavors, with O'Brien and Patricia Quinn playing sibling character actors, Cosmo and Nation McKinley, and Nell Campbell playing Nurse Ansalong.

Richard Timothy Smith, known professionally as Richard O'Brien, is a British-New Zealander actor, writer, musician, and television presenter. He wrote the musical stage show The Rocky Horror Show in 1973, which has since remained in continuous production. He also co-wrote the screenplay along with director Jim Sharman for the film adaptation, The Rocky Horror Picture Show (1975), and appeared on-screen as Riff Raff. The film became an international success and has received a large cult following. O'Brien co-wrote the musical Shock Treatment (1981) and appeared in the film as Dr. Cosmo McKinley.