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- Percy as George
- Duck as Harold
- Thomas as Captain Underpants
- James as Melvin Sneedly
- Diesel as Mr. Krupp (Sir Topham Hatt can't be Mr. Krupp, Sir Topham Hatt is good and Mr. Krupp is bad)
- Daisy as Mrs. Ribble
- Elizabeth as Mrs. Anthrope
- Diesel 10 as Proffessor Poopypants
- Duncan as Dr. Diaper
- Gordon as Tim Bronski
- Henry as Stevie Loopner
- Bulgy as The Bionic Booger Boy