Distributia
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Nat FaxonCaptain Underpants / Mr. Krupp (voice)
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Jay GragnaniHarold (voice)
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Ramone HamiltonGeorge (voice)
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Sean AstinNarrator / Teachertrons (voice)
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Jorge DiazMelvin / Melvinborg (voice)
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Peter HastingsComic Narrator (voice)
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David KoechnerMr. Meaner / Sergeant Boxers (voice)
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Erica LuttrellGrace Wain (voice)