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 (voice)
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Jorge DiazMelvin / Melvinborg / Mr. Rected / Cloggernaut (voice)
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Peter HastingsComic Narrator (voice)
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Erica LuttrellErica / Plungerina (voice)
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Laraine NewmanDr. Mentor / Ms. Ribble (voice)