Cast and credits of I'm Spelling as Fast as I Can (2003)

Jim Reardon

Nancy Kruse

Dan Castellaneta
Homer Simpson / Referee / Krusty the Klown / Groundskeeper Willie / Squeaky-Voiced Teen / Barney Gumble / Mayor Quimby (voice)

Julie Kavner
Marge Simpson (voice)

Nancy Cartwright
Bart Simpson / Nelson Muntz / Ralph Wiggum / Wellesley Sister / Smith Sister (voice)

Yeardley Smith
Lisa Simpson (voice)

Hank Azaria
Frankenstein's Monster / Apu Nahasapeemapetilon / Rib-It / Superintendent Chalmers / Carl / Moe Szyslak / Cletus / Professor Frink / Ribhead #3

Harry Shearer
Ribwich Ad Announcer / Principal Skinner / Lenny / Ribhead #1 / Kent Brockman / Otto / Ribhead #2 (voice)

George Plimpton
George Plimpton (voice)

Pamela Hayden
Jimbo Jones / Milhouse Van Houten / Radcliffe Sister (voice)

Tress MacNeille
Booberella / Brandine / Alex / Barnard Sister / Bryn Mawr Sister / Sun-Moon (voice)

Russi Taylor
Martin Prince / Mount Holyoke Sister / Vassar Sister (voice)

Karl Wiedergott
Ribhead #4 (voice)