"Tom's Rhinoplasty" is the eleventh episode of the first season of the American animated television series South Park. It originally aired on Comedy Central in the United States on February 11, 1998. In the episode, the South Park Elementary boys, including Stan Marsh, become infatuated with the new substitute teacher Ms. Ellen, making Wendy Testaburger (Stan's girlfriend) highly aggravated. Meanwhile, Mr. Garrison gets a nose job that makes him resemble actor David Hasselhoff. "Tom's Rhinoplasty" was the first Valentine's Day-themed episode of the series and was written by series co-creator Trey Parker. The episode advocates the concept of inner beauty through the Mr. Garrison subplot, and shows the boys' efforts to win Ms. Ellen's affection despite the fact that she is a lesbian. Natasha Henstridge makes a guest appearances as Ms. Ellen, marking the first time a celebrity guest played a major role in a South Park episode. She is credited as "The Chick from Species" in the opening credits. The episode marked the first time a real photographic image of a person's head (in this case David Hasselhoff) was superimposed over a cartoon body, a practice which would become common throughout the series. "Tom's Rhinoplasty" introduced the song "No Substitute", which was sung by Chef and was later included on Chef Aid: The South Park Album. Trey Parker and Matt Stone said they were initially unhappy with "Tom's Rhinoplasty" when production of the episode concluded, and were surprised when fans responded positively to it. Plot Valentine's Day approaches, and Wendy suggests to her boyfriend Stan ways to spend time together. However, when their schoolteacher Mr. Garrison decides to get a rhinoplasty, a new substitute arrives named Ms. Ellen (Natasha Henstridge) and all the boys in class find themselves inexplicably enamored with her, including Stan. Wendy becomes incredibly jealous and warns Ms. Ellen to stay away from Stan, unaware that the substitute teacher does not return Stan's affection. Concerned about the children's education, Ms. Ellen reveals she will buy dinner for the winner of a spelling test. The boys actively try to court Ms. Ellen, but Chef (having beaten them to it) warns them she is a lesbian and thus only likes other lesbians. The boys do not realise what this means and try to become lesbians in order to attract Ms. Ellen. Meanwhile, Mr. Garrison's nose job makes him a "hot and sexy" man, with his face resembling David