"Sister Act" is the second segment of the tenth episode of The Buzz on Maggie.
- Jeff Bennett as Principal Peststrip and the director
- S. Scott Bullock as Snap Carpenter
- Jess Harnell as Eugene and Wendell
- Candi Milo as Mrs. Wingston and the director's assistant
- Tara Strong as Dawn Swatworthy and Bella
- Cree Summer as Gym Shorts Kid
- Kevin Michael Richardson as Maggie's brain