Captain Underpants / Mr. Krupp (voice)

Harold (voice)

George (voice)

Narrator (voice)

Jessica / Dressy (voice)

Santa (voice)

Melvin / Stanley Peet (voice)

Comic Narrator (voice)

Steve "Gooch" Yamaguchi (voice)

Mr. Meaner (voice)

Erica / George's Mom (voice)

Miss Anthrope / Harold's Mom (voice)

Bo Hweemuth (voice)

Yule Tide / Lee Dingman / Movie Harold / Movie Santa (voice)

George's Dad / Movie George (voice)