• Percy as George
  • Thomas as Harold
  • Gordon as Captain Underpants
  • Smudger as Melvin Sneedly
  • Diesel 10 as Mr. Krupp
  • Daisy as Mr. Ribbles
  • Mavis as Mr. Anthrope
  • Bulgy as Mr. Meaner
  • Diesel as Captain Blunderpants
  • Arry as Evil George
  • Bert as Evil Harold
  • George as Evil Sulu
  • Rheneas as Sulu
  • Skarloey as Cracker
  • Duck as Harold's Grandpa
  • Lady as George's Grandma
  • Edward as George's Dad
  • Molly as Harold's Mom

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