Kenan Thompson

as Fat Albert

Kyla Pratt

as Doris Robertson

Dania Ramirez

as Lauri Robertson

Shedrack Anderson III

as Rudolph "Rudy" Davis

Jermaine Williams

as James "Mushmouth" Mush

Keith D. Robinson

as William Henry "Bill" Cosby Jr.

Marques Houston

as "Dumb" Donald Parker

Aaron Frazier

as "Old Weird" Harold Simmons

Bill Cosby

as Self

Omarion

as Reggie

Keri Lynn Pratt

as Heather

Alice Greczyn

as Becky

Dylan Cash

as Emmitt

Alphonso McAuley

as Bucky Miller

Aaron Carter

as Teen

J. Mack Slaughter

as Arthur

Nick Zano

as Camera Salesman

Annie Abbott

as Mrs. Forchick

Rick Overton

as Coach Gillespie

Fonzworth Bentley

as Salesman

Jeff Leaf

as Basketball Player

Jeanne Chinn

as Woman #1

Raven-Symoné

as Danielle (voice)

Ben Diskin

as Teen #2 (voice)

Catero Colbert

as Lead Teen (voice)

Michael Franklin

as Dancer

Jeff Harlan

as Dad

Cody Fleetwood

as Kid

Jenifer Yeuroukis

as Woman #2

Alyssa Shafer

as Little Girl

Damon Elliott

as DJ

Jeremy Suarez

as Russell (voice)

Earl Billings

as Mr. Mudfoot (voice)

Charles Duckworth

as Teen #1 (voice)

Jeff Garlin

as Jer

Monica Allison

as Additional Voices (voice)

Joe Koons

as Hero - Track Star (uncredited)