Cast
- Diesel as Horrid Henry
- BoCo as Perfect Peter
- Edward as Brainy Brain
- Daisy as Moody Margaret
- Pip/Emma (from the RWS) as Sour Susan
- Gordon as Aerobic Al
- Henry as Anxious Andrew
- Dennis as Weepy William
- Molly as Singing Soraya
- Emily as Gorgeous Gurinder
- Lady as Lazy Linda
- Bill as Spotless Sam
- Ben as Tidy Ted
- Arry/Bert as Mischievous Mike
- Duck as Goody-Goody Gordon
- James as Henry's Dad
- Mavis as Henry's Mum
- Diesel 10 as Rude Ralph
- D199 as Stuck Up Steve
- D261 as Mr. Nerdon
- Flora as Rich Aunt Ruby
- Rosie as Prissy Polly
- Duncan as Pimply Paul
- Spencer as Slimy Sammy