High Quality Content by WIKIPEDIA articles! "Lisa`s Substitute" is the nineteenth episode of The Simpsons` second season. It originally aired on Fox 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.