Aaron Taylor-Johnson
Jamie
Alfie Williams
Spike
Ralph Fiennes
Dr. Kelson
Jodie Comer
Isla
Jack O'Connell
Sir Jimmy Crystal
Chi Lewis-Parry
Samson
Edvin Ryding
Erik Sundqvist
Christopher Fulford
Sam
Stella Gonet
Jenny
Kim Allan
Jimmy's Mother
Sandy Batchelor
Jimmy’s Father
Geoffrey Newland
Anthony
Joe Blakemore
Dave
Celi Crossland
Pregnant Infected
Robert Rhodes
Jimmy Jimmy
Erin Kellyman
Jimmy Ink
Sam Locke
Jimmy Fox
Maura Bird
Jimmy Jones
Ghazi Al Ruffai
Jimmy Snake
Emma Laird
Jimmima
Connor Newall
Jimmy Shite
Haley Flaherty
Jimmy's Auntie
Gordon Alexander
Jonno (uncredited)
Col Needham
Dead Body #6 (Uncredited)
Kris Deedigan
Guy (uncredited)
Sienna Giblin
Girl Villager
Amy Cameron
Rosey
Rocco Haynes
Young Jimmy
Hayley Walters
Teenage Girl Villager
Peter Labas
Slow Low #1
Kat Kitchener
Slow Low #2
Jason Kuang Yao Lee
Slow Low #3
Ember Storm
Slow Low #4
Jake Grimes
Hanging Man
Chris Gregory
Berserker
Helen Rowlands
Infected Woman
Harriet Taylor
Jimmy's Cousin Delilah
Hannah Allan-Robertson
Jimmy's Sister
Annabelle Graham
Jimmy's Sister
Olivia Morley
Jimmy's Sister
Theadora Rawlings
Jimmy's Sister
Darcie Smith
Jimmy's Sister
Isla Vickers
Jimmy's Sister
Lachlan Tucker
Baby Isla
Winnow Short
Baby Isla
Olivia Grace Lee
Baby Isla
Lucas Toole
Baby Isla
Cohen Lewis Williamson
Baby Isla
Myles Woodhouse
Baby Isla
Angus Neill
Emaciated Infected (uncredited)
RuMac
Accordionist (uncredited)
Toyah Willcox
Teletubbies Narrator (voice) (archive recording) (uncredited)