The Simpsons Season 16 Episode 21
The Father, the Son and the Holy Guest Star
Bart gets expelled from school and transfers to a Catholic school, where a hip priest named Father Sean tries to convert Bart and Homer to Catholicism, which worries Marge when she believes that Catholics do not go to the same heaven as Protestants and discovers that Catholic women do not use birth control.
Guest Stars
Liam Neeson
Father Sean (voice)
Marcia Wallace
Edna Krabappel (voice)