Diretor/a
Octavio E. Rodriguez
DIRETOR/A
Todd Grimes
Erik Kling
David H. Brooks
John Harvatine IV
Seung Woo Cha
Kevin Peaty
Elenco (na ordem dos créditos)
Nat Faxon
Captain Underpants
Ramone Hamilton
George
Sean Astin
Narrator
Peter Hastings
Comic Narrator
Jorge Diaz
Melvin
Dayci Brookshire
Jessica
Erica Luttrell
Erica
Evan Kishiyama
Steve 'Gooch' Yamaguchi
David Koechner
Mr. Meaner
Patty Mattson
Miss Anthrope
Brennan Murray
Bo Hweemuth
Laraine Newman
Ms. Ribble
Clancy Brown
Mr. Ree
Nolan North
Cash Networth
Eric Bauza
Rap Talkwell
Mindy Sterling
Melvin's Mom
Kevin Michael Richardson
Diddly Saurus
Trevor Devall
Smartsy Fartsy
Max Koch
Hank
Maggie Wheeler
Lunch Lady
Tress MacNeille
Ms. Hurd
Fred Tatasciore
Chief Hairococha
Lewis Black
Ragely J. Snarlingtooth
John DiMaggio
Smelly Socktopus
Jim Rash
Señor 'Jerry' Citizen
Stephen Root
Avacadwoe
Toby Huss
Caesar
Paul Rugg
Altitooth
Rob Riggle
Theodore 'Ted' Murdsly
Maurice LaMarche
Tubbadump
Dawn Wells
Gumbalina Toothington
Steve-O
Lane Junkston
Kari Wahlgren
Mayor Hoppy McChapper
Tom Wilson
Camoflush
Secunda Wood
Hailey Comet
Jay Gragnani
Harold
Tudi Roche
Bernice Krupp