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as Bo Hweemuth (voice)
as Mr. Meaner (voice)
as Jessica / Dressy (voice)
as Erica / George's Mom (voice)
as Steve 'Gooch' Yamaguchi (voice)
as Harold (voice)
as Santa (voice)
as Melvin / Stanley Peet (voice)
as George's Dad / Movie George (voice)
as Captain Underpants / Mr. Krupp (voice)
as Yule Tide / Lee Dingman / Movie Harold / Movie Santa (voice)
as Miss Anthrope / Harold's Mom (voice)
as Comic Narrator (voice)
as George (voice)
as Narrator (voice)