Robin Williams

Character: Lance Clayton

Alexie Gilmore

Character: Claire Reed

Daryl Sabara

Character: Kyle Clayton

Evan Martin

Character: Andrew Troutman

Geoff Pierson

Character: Principal Wyatt Anderson

Henry Simmons

Character: Mike Lane

Mitzi McCall

Character: Bonnie McBon

Jermaine Williams

Character: Jason

Lorraine Nicholson

Character: Heather Johnson

Morgan Murphy

Character: Morgan

Toby Huss

Character: Bert Green

Tom Kenny

Character: Jerry Klein

Jill Talley

Character: Make-Up Woman

Bruce Hornsby

Character: Himself

Krist Novoselic

Character: Newspaper Vendor

Bobcat Goldthwait

Character: Limo Driver (uncredited)

Tony V.

Character: Dr. Pentola

Naomi Glick

Character: Ginger

Dan Spencer

Character: Dan Spencer

Zachary Vitale

Character: Peter (as Zach Sanchez)

Ellyn Jameson

Character: Jennifer

Michael Thomas Moore

Character: Chris

Ray Buckley

Character: Metal Kid

Rebecca Erwin Spencer

Character: Nosy Neighbor

Cheri Minns

Character: Nosy Neighbor

Zazu

Character: Nosy Neighbor

Mable Mae

Character: Mabel

Deborah Horne

Character: Dr. Dana

Riley Dean Stone

Character: Bruce Hornsby's Mic Stand

Ray Buckley

Character: Metal Kid

Zoe

Character: The Fighting Pug