• George as Percy
  • Harold as Duck
  • Captain Underpants as Thomas
  • Mr. Krupp as Gordon
  • Mrs. Ribble as Daisy
  • Mrs. Anthrope as Elizabeth
  • Melvin Sneedly as Diesel
  • Jessica Gordon as Emily
  • Stephanie Yarkoff as Rosie
  • Sulu as Dennis
  • Crackers as Neville
  • Dr. Diaper as Duncan
  • Proffesor Poopypants as Diesel 10
  • Talking Toilets as Troubleosme Trucks

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