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Nat Faxon as Captain Underpants / Mr. Krupp / Buffalobe (voice) |
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Jay Gragnani as Harold Hutchins (voice) |
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Ramone Hamilton as George Beard / Young Mr. Cleveland (voice) |
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შონ ესთინი as Narrator / Putter Mulligan (voice) |
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Dayci Brookshire as Jessica / Dressy / Smartaconda (voice) |
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Jorge Diaz as Melvin / Stanley Peet (voice) |
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Todd Grimes as Benjamin Franklin (voice) |
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Peter Hastings as Comic Narrator / Marlin (voice) |
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Evan Kishiyama as Steve 'Gooch' Yamaguchi (voice) |
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David Koechner as Mr. Meaner (voice) |
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Phil LaMarr as Mr. Cleveland / Viper Chai (voice) |
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Erica Luttrell as Erica (voice) |
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Patty Mattson as Miss Anthrope (voice) |
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Brennan Murray as Bo Hweemuth (voice) |
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Nolan North as Lee Dingman / Hugo Mouthingwad (voice) |
| Writing | Dav Pilkey | Novel |
| Writing | Mark Banker | Writer |
| Editing | Anna Saathoff | Assistant Editor |
| Writing | Matt Smith | Writer |
| Writing | Peter Hastings | Writer |
| Directing | Todd Grimes | Director |
| Production | Ania O'Hare | Casting |
| Production | Cymbre Walk | Casting |
| Sound | Jared Faber | Music |
| Sound | Fred Kron | Music |
| Production | Peter McCown | Line Producer |
| Production | Ashley Laidlaw | Line Producer |
| Production | Todd Grimes | Supervising Producer |
| Production | Peter Hastings | Executive Producer |
| Art | Andrew Bendik | Storyboard Artist |
| Art | Grahaeme Cowie | Storyboard Artist |
| Art | Ryan Hansen | Storyboard Artist |
| Art | Erik Kling | Storyboard Artist |
| Art | Derek Moore | Storyboard Artist |
| Art | Andrew Murray | Storyboard Artist |
| Art | Kevin Peaty | Storyboard Artist |
| Art | Jocelan Thiessen | Storyboard Artist |
| Art | Ian Young | Storyboard Artist |
| Production | David Wiebe | Executive In Charge Of Production |
