Most of us know about Phil Hartman as Captain Carl and Laurence Fishburne as Cowboy Curtis, but there was also S. Epatha Merkerson as Mailman Reba and Natasha Lyonne as a neighborhood kid named Opal. Behind the scenes we had Sally Hershberger as the hair stylist; Rob Zombie and John Singleton as production assistants and Dweezil Zappa, Todd Rundgren, George Clinton and Danny Elfman as composers.

http://www.mentalfloss.com/blogs/archives/17939