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Nat Faxon

Captain Underpants/Mr. Krupp

Jay Gragnani

George Beard

Ramone Hamilton

Harold Hutchins

David Koechner

Mr. Meaner

Peter Hastings

Comic Narrator

Tress MacNeille

Ms. Hurd

Laraine Newman

Ms. Tara Ribble

Stephen Root

Mr. Morty Fyde

Jorge Diaz (actor)

Melvin Sneedly

Mindy Sterling

Melvin's mom

Evan Kishiyama

Steve 'Gooch' Yamaguchi

Erica Luttrell

Erica Wang

Patty Mattson

Miss Anthrope

Dayci Brookshire

Jessica Gordon