Horrid Henry

Theo Stevenson

Miss Battleaxe

Anjelica Huston

Perfect Peter

Ross Marron

Miss Lovely

Parminder Nagra

Vic Van Wrinkle

Richard E. Grant

Ed Banger

Noel Fielding

Dad

Mathew Horne

Sour Susan

Helena Barlow

Mum

Siobhan Hayes

Great Aunt Greta

Prunella Scales

Soggy Sid

David Schneider

Demon Dinner Lady

Jo Brand

Prissy Polly

Kimberley Walsh

Moody Margaret

Scarlett Stitt

Rude Ralph

Lloyd Howells

Miss Oddbod

Rebecca Front

Rich Aunt Ruby

Helen Lederer

Weeping William

Billy Kennedy

Stuck-Up Steve

Tyger Drew-Honey

Aerobic Al

Jack Sanders

Brainy Brian

Reuben Lee

Gorgeous Gurinda

Nikita Mistry

Spotless Sam

Frank Kauer

Goody Goody Gordon

Joshua-James Thomas

Madam Tutu / Fang (voice)

Tamsin Heatley

2C4S Presenter 1

Dominic Wood

2C4S Presenter 2

Richard McCourt

Tidy Ted

Zac Gabriel Werb

Alice

Keely Cat Wells

Vicious Vicky

Kia Pegg

Keepy Uppy Boy

Sam Davis

Schoolboy (uncredited)

Freddie Rose

Schoolboy (uncredited)

Harvey Walsh