• Henry as Captain Underpants
  • Milo as George
  • Roy as Harold
  • Oscar as Mr. Krupp
  • Fergus as Tippy Tinkletrousers
  • Cobby as George's Dad
  • Summer as Harold's Mom
  • Denzel as George's Grandpa
  • Gertie as Harold's Grandma
  • Izzy as Edith
  • Meg as Ms. Anthrope
  • Roddy as Porfessor Poopypants
  • Glimmer Known as Melvin
  • Monsterdargon as Turbo Toilet 2000
  • Mini-Monsters as The Talking Toilets

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