Major Margaret "Hot Lips" Houlihan was a fictional character first created in the book M*A*S*H: A Novel About Three Army Doctors by Richard Hooker. Actress Sally Kellerman portrayed her in the Robert Altman film adaptation (where the character was renamed "O'Houlihan"; however, like many of the M*A*S*H* characters, Hot Lips is probably best known from the television series, where her part was played by actress Loretta Swit. Having the advantage of an 11-year run on television, Swit's Houlihan became a significantly more developed character than originally portrayed in the film by actress Sally Kellerman, in many ways demonstrating characteristics that would have been almost antithetical to the cinematic Hot Lips.