"Lisa's Substitute" is the nineteenth episode of The Simpsons second season. It first started on Fox in the United States on April 25, 1991. In this episode, Lisa's teacher Miss Hoover gets Lyme disease, so substitute teacher "Mr. Bergstrom" takes over the class. Lisa finds Mr. Bergstrom's teaching methods inspiring and finds a whole new love for learning. When Miss Hoover returns to class, Lisa is sad to lose her most positive adult role model. Eventually, she knows that while Mr. Bergstrom was one of a kind, she can find role models in other people, like her father Homer. Meanwhile, Bart runs for class president against "Martin."