Nat Faxon
Captain Underpants / Mr. Krupp / Buffalobe (voice)
Acting
Jay Gragnani
Harold Hutchins (voice)
Acting
Ramone Hamilton
George Beard / Young Mr. Cleveland (voice)
Acting
Sean Astin
Narrator / Putter Mulligan (voice)
Acting
Dayci Brookshire
Jessica / Dressy / Smartaconda (voice)
Acting
Jorge Diaz
Melvin / Stanley Peet (voice)
Acting
Todd Grimes
Benjamin Franklin (voice)
Directing
Peter Hastings
Comic Narrator / Marlin (voice)
Directing
Evan Kishiyama
Steve "Gooch" Yamaguchi (voice)
Acting
David Koechner
Mr. Meaner (voice)
Acting
Phil LaMarr
Mr. Cleveland / Viper Chai (voice)
Acting
Erica Luttrell
Erica (voice)
Acting
Patty Mattson
Miss Anthrope (voice)
Acting
Brennan Murray
Bo Hweemuth (voice)
Acting
Nolan North
Lee Dingman / Hugo Mouthingwad (voice)
Acting