Sister Act is a movie.
Kathy Najimy . She is best known for voicing Peggy Hill on the animated television series King of the Hill , and her roles as Sister Mary Patrick in the comedy film Sister Act , Mary Sanderson in the comedy-horror film Hocus Pocus , and Olive Massery on the comedy series Veronica 's Closet . Sister Act is a 1992 American musical comedy film directed by Emile Ardolino and written by Joseph Howard . Featuring musical arrangements by Marc Shaiman , the film stars Whoopi Goldberg as a Reno lounge singer who has been put under protective custody in a San Francisco convent of Poor Clares and has to pretend to be a nun when a mob boss puts her on his hit list . Also in the cast are Maggie Smith , Kathy Najimy , Wendy Makkena , Mary Wickes , and Harvey Keitel . One of the most financially successful comedies of the early 1990s , grossing $ 231 million worldwide , the film was rated # 83 on Bravo 's The 100 Funniest Movies list .