Gentleman Jim is a 1942 film starring Errol Flynn as heavyweight boxing champion James J. Corbett (1866-1933). The supporting cast includes Alexis Smith, Jack Carson, Alan Hale, William Frawley, and Ward Bond. The movie was based upon Corbett's autobiography, The Roar of the Crowd, and directed by Raoul Walsh. James John Corbett became world heavyweight boxing champion on March 17, 1897 when he knocked out John L. Sullivan in twenty-one rounds. He was the first successful fighter to use the Marquis of Queensberry rules.