Brain Donors is a 1992 American comedy film directed by Dennis Dugan and released by Paramount Pictures, loosely based on the Marx Brothers comedies A Night at the Opera and A Day at the Races. The film co-stars John Turturro, Mel Smith, and Bob Nelson in the approximations of the Groucho, Chico, and Harpo roles, with Nancy Marchand in the Margaret Dumont dowager role. It was executive produced by David and Jerry Zucker, through their Zucker Brothers Productions.

A Night at the Opera is a 1935 American comedy film starring the Marx Brothers, and featuring Kitty Carlisle, Allan Jones, Margaret Dumont, Sig Ruman, and Walter Woolf King. It was the first of five films the Marx Brothers made under contract for Metro-Goldwyn-Mayer after their departure from Paramount Pictures, and the first after Zeppo left the act. The film was written by George S. Kaufman and Morrie Ryskind from a story by James Kevin McGuinness, with additional uncredited dialogue by Al Boasberg. The film was directed by Sam Wood.