Ralph Fiennes

Dr. Ian Kelson

Alfie Williams

Spike

Jack O'Connell

Sir Lord Jimmy Crystal

Chi Lewis-Parry

Samson

Erin Kellyman

Jimmy Ink

Emma Laird

Jimmima

Sam Locke

Jimmy Fox

Robert Rhodes

Jimmy Jimmy

Ghazi Al Ruffai

Jimmy Snake

Maura Bird

Jimmy Jones

Connor Newall

Jimmy Shite

Louis Ashbourne Serkis

Tom

David Sterne

Grandfather

Cillian Murphy

Jim (uncredited)