• James as Horrid Henry
  • Oliver as Perfect Peter
  • Mr. Percival as Henry's Dad
  • Mrs. Percival as Henry's Mom
  • Trevor as Fluffy the Cat
  • Paxton as Fang the Hamster
  • Gordon as Mutant Max
  • Bill as Rude Ralph
  • Ben as Mischievous Mike
  • Caroline as Moody Margaret
  • Rosie as Sour Susan
  • Stanley as Brainy Brian
  • Sir Handel as Anxious Andrew
  • Flynn as Beefy Bert
  • D261 as Slimmy Sammy
  • Whiff as Goody-Goody Gordon
  • Dennis as Tidy Ted
  • Thomas as Spotless Sam
  • Duck as Wimpy William
  • Isobella as Miss Battle-Axe
  • Emily as Mrs. Battle-Axe
  • Diesel 10 as Mr. Mossy
  • Daisy as Mrs. Mossy
  • Diesel as Stuck-up Steve
  • Spamcan as Bossy Bill

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