“Lisa the Vegetarian“ is the fifth episode of The Simpsons ’ seventh season.[3] It originally aired on the Fox network in the United States on October 15, 1995.[1] In the episode, Lisa decides to stop eating meat after bonding with a lamb at a petting zoo. Her schoolmates and family members ridicule her for her beliefs, but with the help of Apu, Paul, and Linda McCartney, she commits to vegetarianism.
Directed by Mark Kirkland, “Lisa the Vegetarian“ is the first full-length episode David X. Cohen wrote for The Simpsons. David Mirkin, the show runner at the time, supported the episode in part because he had just become a vegetarian himself. Dan Castellaneta, the voice of Homer Simpson, is also a vegetarian. Former Beatle Paul McCartney and his then wife Linda McCartney guest star in the episode. Paul McCartney’s condition for appearing was that Lisa would remain a vegetarian for the rest of the series. The episode makes several references to McCartney’s musical career, and his song “Maybe I’m Amazed“ plays during the closing credits.