"Lisa's Substitute" is the nineteenth episode of the second season of the American animated television series The Simpsons. It originally aired on the Fox network in the United States on April 25, 1991. In the episode, Lisa's teacher Miss Hoover takes medical leave due to what she thinks is Lyme disease, so substitute teacher Mr. Bergstrom takes over the class. Lisa finds Mr. Bergstrom's teaching methods inspiring and discovers an entirely new love for learning. When Miss Hoover returns to class, Lisa is devastated to lose her most positive adult role model. Eventually, she realizes that while Mr. Bergstrom was one of a kind, she can find role models in other people, including her father Homer. Meanwhile, Bart runs for class president against Martin. The episode was written by Jon Vitti and directed by Rich Moore. It is the first episode of the show to have the opening sequence start at the driveway scene. Dustin Hoffman, using the pseudonym Sam Etic, guest-starred as Mr. Bergstrom, who was modeled on the physical appearance of Mike Reiss, a longtime writer and producer on the show. The episode features cultural references to Mike Nichols's film The Graduate, which starred Hoffman, and the novel Charlotte's Web by E. B. White. Since airing, the episode has received positive reviews from television critics. It acquired a Nielsen rating of 11.1, and was the highest-rated show on Fox the week it aired. Plot Lisa's teacher, Miss Hoover, announces to her class that she has Lyme disease, and is taking a leave of absence, prompting her to be replaced by substitute teacher Mr. Bergstrom. Mr. Bergstrom is dressed as a cowboy, setting the scene in 1830 Texas. Mr. Bergstrom is impressed by Lisa's knowledge of his deliberate anachronisms, and rewards her with his cowboy hat. Due to his unorthodox teaching methods and friendly nature, Lisa starts to develop a fascination of him. Lisa runs into Mr. Bergstrom at a museum and is embarrassed when Homer displays his ignorance. Sensing a void in their relationship, Mr. Bergstrom takes Homer aside to suggest he be a more positive role model. At Marge's suggestion, Lisa goes to invite Mr. Bergstrom to dinner at their home, but is devastated to find Miss Hoover back and Mr. Bergstrom gone. She rushes to his apartment and learns that he has accepted a new job in Capital City. She rushes to the train station and