Peter Farrelly Director, Producer Robert Farrelly Director, Producer Bill Murray Frank Actor Molly Shannon Mrs. Boyd Actor Chris Elliott Bob Actor Elena Franklin Shane Detomello Actor Danny Murphy Zookeeper Superintendent Actor Chris Rock Osmosis Voice Laurence Fishburne Thrax Voice David Hyde Pierce Drix Voice Brandy Norwood Leah Voice William Shatner The Mayor Voice Ron Howard Tom Colonic Voice Piet Kroon Animation Director Tom Sito Animation Director Bradley Thomas Producer Zak Penn Producer Dennis Edwards Producer Marc Hyman Writer Mark Irwin Cinematographer Sydney J. Bartholomew Jr. Production Design Randy Edelman Original Music Arlan Jay Vetter Art Director Scott Jacobson Set Decoration Pamela Withers Costume Design Rick Montgomery Casting Lois Freeman-Fox Film Editing Sam Seig Film Editing