Michael lent his voice to Leon Kompowsky in the Season 3 premiere of The Simpsons

"Stark Raving Dad" is the season premiere of the third season of American animated television series The Simpsons. It first aired on the Fox network in the United States on September 19, 1991. In the episode, Homer is forced to wear a pink shirt to work one day as a result of a laundry accident and is mistaken for a "free thinking anarchist". He is sent to a mental institution, where he shares a room with a large white man named Leon Kompowsky who pretends to be Michael Jackson. Meanwhile, because he normally forgets her birthday, Bart promises his sister Lisa that he will get her the best present ever.
Michael Jackson guest starred in the episode as the speaking voice of Leon Kompowsky. For contractual reasons, he was credited as John Jay Smith in the closing credits, and his role in the episode was not officially confirmed until later. Michael was a fan of of the show and called creator Matt Groening one night offering to do a guest spot. Jackson pitched several story ideas for the episode and wrote the song "Happy Birthday Lisa" that is featured in the plot. He also stipulated that he would provide Kompowsky's speaking voice, but his singing voice would be performed by a sound-alike (Kipp Lennon) because he wanted to play a joke on his brothers. The episode contains references to many aspects of Jackson's career, with Kompowsky singing portions of the songs "Billie Jean" and "Ben".

Stark Raving Dad" received generally positive reviews from critics, particularly for the writing and Jackson's performance
Michael pitched several story ideas for the episode, such as Bart telling everyone in town that Michael Jackson was coming to his house. He requested that there be a scene in which he and Bart wrote a song together. He also asked that a joke about Prince be changed to one about Elvis Presley
According to Jean- The Simpsons Writer, Michael would not commit to the episode until after a read-through of the script was done. The read was held at Jackson's manager Sandy Gallin's house, and Dan Castellaneta (who provides the voice for Homer) was thirty minutes late. Jean recalls that "no one said a word, we just sat there waiting".Following the read, MJ stipulated his conditions: he would record his speaking parts but not receive credit, and his singing voice would be performed by a sound-alike.Leon Kompowsky's singing voice was instead performed by Kipp Lennon, because Jackson wanted to play a joke on his brothers and fool them into thinking the impersonator was him. Lennon recorded his lines at the same time as Jackson, who found the impersonations
hilarious. Jackson showed up for the recording session alone and did not use the special trailer that was set up for him. According to Jean, Jackson did record versions of the singing-parts, and while there have been rumors that those parts were the ones used in the final episode, The Simpsons music editor Chris Ledesma has stated the Lennon versions were used. Kompowsky's normal speaking voice that is heard at the end was recorded by cast member Hank Azaria.
The episode originally was supposed to end with Kompowsky singing a portion of "Man in the Mirror" in his Michael Jackson voice as he walked down the road, but it was changed to him singing the beginning of "Happy Birthday Lisa" in his normal voice.

MJ was a huge fan of the character Bart. In addition to doing a guest spot on the show, he wanted to give Bart a number one single. He therefore co-wrote the song "Do the Bartman", which was released as a single around the same time that the episode was produced. Jackson could not take credit for his work on the song because of contractual reasons. Mike also wrote the song "Happy Birthday Lisa", which was later included in the album Songs in the Key of Springfield.