Cast
- Diesel as Horrid Henry
- Madge as Perfect Peter
- The Fat Controller as Dad
- Percy as Goody-Goody Gordon
- Emily as Gorgeous Gurinder (Diesel 10 can't be Gorgeous Gurinder, Diesel 10 is evil and male, Gorgeous Gurinder is good and female)
- Thomas as Tidy Ted
- Henry as Brainy Brian (Mavis can't be Brainy Brian, Mavis is female, Brainy Brian is male)
- Spencer as Stuck Up Steve (Molly can't be Stuck Up Steve, Molly is kind and female, Stuck Up Steve is mean and male)
- Daisy as Moody Margret (James can't be Moody Margaret, James is male, Moody Margaret is female)
- Mavis as Sour Susan
- Caroline as Lazy Linda (Spencer can't be Lazy Linda, Spencer is male, Lazy Linda is female)
- Molly as Prissy Polly (Boco can't be Prissy Polly, Boco is male, Prissy Polly is female)
- Duck as Mr. Mossy