World's Greatest Dad

Robin Williams

Lance Clayton

Tom Kenny

Jerry Klein

Henry Simmons

Mike Lane

Geoff Pierson

Principal Wyatt Anderson

Toby Huss

Bert Green

Lorraine Nicholson

Heather Johnson

Mitzi McCall

Bonnie McBon

Jill Talley

Make-Up Woman

Krist Novoselic

Newspaper Vendor

Daryl Sabara

Kyle Clayton

Alexie Gilmore

Claire Reed

Bobcat Goldthwait

Limo Driver (uncredited)

Ellyn Jameson

Jennifer

Dan Spencer

Dan Spencer

Tony V.

Dr. Pentola

Ray Buckley

Metal Kid

Jermaine Williams

Jason

Evan Martin

Andrew Troutman

Morgan Murphy

Morgan

Bruce Hornsby

Himself

Naomi Glick

Ginger

Zachary Vitale

Peter (as Zach Sanchez)

Michael Thomas Moore

Chris

Rebecca Erwin Spencer

Nosy Neighbor

Cheri Minns

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Zazu

Nosy Neighbor

Mable Mae

Mabel

Deborah Horne

Dr. Dana

Riley Dean Stone

Bruce Hornsby's Mic Stand

Ray Buckley

Metal Kid

Zoe

The Fighting Pug