Theo Stevenson
Horrid Henry
Anjelica Huston
Miss Battleaxe
Ross Marron
Perfect Peter
Parminder Nagra
Miss Lovely
Mathew Horne
Dad
Siobhan Hayes
Mum
Richard E. Grant
Vic Van Wrinkle
Prunella Scales
Great Aunt Greta
Scarlett Stitt
Moody Margaret
Lloyd Howells
Rude Ralph
David Schneider
Soggy Sid
Kimberley Walsh
Prissy Polly
Billy Kennedy
Weeping William
Noel Fielding
Ed Banger
Jo Brand
Demon Dinner Lady
Helen Lederer
Rich Aunt Ruby
Rebecca Front
Miss Oddbod
Jack Sanders
Aerobic Al
Reuben Lee
Brainy Brian
Helena Barlow
Sour Susan
Nikita Mistry
Gorgeous Gurinda
Frank Kauer
Spotless Sam
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
Zac Gabriel Werb
Tidy Ted
Keely Cat Wells
Alice
Kia Pegg
Vicious Vicky
Sam Davis
Keepy Uppy Boy
Freddie Rose
Schoolboy (uncredited)
Harvey Walsh
Schoolboy (uncredited)
Directing
Writing
Production
Keri Atkins
Associate Producer
Claire Barry
Line Producer
Paul Brett
Executive Producer
Caroline Levy
Co-Producer
Allan Niblo
Executive Producer
James Richardson
Executive Producer
Tim Smith
Executive Producer
James Swarbrick
Executive Producer
Huberta von Liel
Production Supervisor
Mike Watts
Executive Producer
Nigel Williams
Executive Producer
Rupert Preston
Producer
Lucinda Whiteley
Producer
Gary Davy
Casting
Suzanne Smith
Casting
Sound
Camera
Editing
Art
Costume & Make-Up
Colleen Kelsall
Costume Design
Sophia Spink
Assistant Costume Designer
Sunny Rowley
Costume Supervisor
Jemma Carballo
Makeup Artist
Angie Mudge
Makeup Artist
Adrian Rigby
Special Effects Makeup Artist