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- Diesel 10 as Horrid Henry (Diesel 10 and Horrid Henry are both villians)
- Bill/Ben as Perfect Peter (Perfect Peter's voice suits Bill/Ben)
- Lady Hatt as Henry's Mum
- The Fat Controller as Henry's Dad
- Percy as Goody-Goody Gordon (Thomas and Percy are best friends, just like Perfect Peter and Goody-Goody Gordon)
- Emily as Gorgeous Gurinder
- Thomas as Brainy Brian (Thomas and Brainy Brian are both smart)
- Gordon as Mr. Mossy
- James as Stuck-Up Steve
- Daisy as Moody Margret
- Mavis as Sour Susan
- Rosie as Prissy Polly