Finn Cole

Don Wallace

Asa Butterfield

Willoughby Blake

Hermione Corfield

Clemsie Lawrence

Simon Pegg

Meredith Houseman

Michael Sheen

The Bat

Nick Frost

Woody Chapman

Tom Rhys Harries

Clegg

Isabella Laughland

Kay

Kit Connor

Wootton

Jamie Blackley

Caspar de Brunose

Margot Robbie

Audrey

Jo Hartley

Babs Wallace

Jane Stanness

Matron

Louis Strong

Smudger

Jassa Ahluwalia

Yuri

Cory Chambers

Bello

Alan Drake

Butler

Charles Evans

Mikey

Charlie Fitzherbert

Tomkinson

Alhaji Fofana

Chibwe

Hanako Footman

Poppet

Gary Golding

Hedger

Rohan Gotobed

Scholar Bartlett

Nick Kellington

The Beast

Alex Macqueen

Lambert

Levi Masoet

Dr. François

Neil Pendleton

Red Dreads

Max Raphael

Hargreaves

James Woodroffe

Teddy Chapman

Joshua Squire

Olympus Boy (uncredited)

Toby Cordes

Sparta Boy (uncredited)

Ted Day

Sparta Boy (uncredited)

Thomas Farrow-Tomson

Sparta Boy (uncredited)

Harry Isherwood

Sparta Boy (uncredited)

Aron Jackson

Sparta Boy (uncredited)

Mateusz Kobylec

Sparta Boy (uncredited)

Sam Redland

Sparta Boy (uncredited)

Zaak Conway

Tiny New Boy (uncredited)

Jack Webb

Xenephon Boy (uncredited)

Ben Wheeler

Xenephon Boy (uncredited)

Lee Charles

Special Security (uncredited)