Theo Stevenson
Horrid Henry
Anjelica Huston
Miss Battleaxe
Parminder Nagra
Miss Lovely
Richard E. Grant
Vic Van Wrinkle
Prunella Scales
Great Aunt Greta
Scarlett Stitt
Moody Margaret
Kimberley Walsh
Prissy Polly
Billy Kennedy
Weeping William
Jo Brand
Demon Dinner Lady
Helen Lederer
Rich Aunt Ruby
Nikita Mistry
Gorgeous Gurinda
Joshua-James Thomas
Goody Goody Gordon
Tyger Drew-Honey
Stuck-Up Steve
Tamsin Heatley
Madam Tutu / Fang (voice)
Dominic Wood
2C4S Presenter 1
Richard McCourt
2C4S Presenter 2
Freddie Rose
Schoolboy (uncredited)
Harvey Walsh
Schoolboy (uncredited)
