World's Greatest Dad

Robin Williams

Lance Clayton

Alexie Gilmore

Claire Reed

Daryl Sabara

Kyle Clayton

Evan Martin

Andrew Troutman

Geoff Pierson

Principal Wyatt Anderson

Henry Simmons

Mike Lane

Mitzi McCall

Bonnie McBon

Jermaine Williams

Jason

Lorraine Nicholson

Heather Johnson

Morgan Murphy

Morgan

Toby Huss

Bert Green

Tom Kenny

Jerry Klein

Jill Talley

Make-Up Woman

Bruce Hornsby

Himself

Krist Novoselic

Newspaper Vendor

Bobcat Goldthwait

Limo Driver (uncredited)

Tony V.

Dr. Pentola

Naomi Glick

Ginger

Dan Spencer

Dan Spencer

Zachary Vitale

Peter (as Zach Sanchez)

Ellyn Jameson

Jennifer

Michael Thomas Moore

Chris

Ray Buckley

Metal Kid

Rebecca Erwin Spencer

Nosy Neighbor