James McAvoy

Victor Frankenstein

Daniel Radcliffe

Igor

Jessica Brown Findlay

Lorelei

Andrew Scott

Inspector Turpin

Freddie Fox

Finnegan

Charles Dance

Frankenstein

Daniel Mays

Barnaby

Callum Turner

Alistair

Bronson Webb

Rafferty

Spencer Wilding

Nathaniel / Prometheus 2

Robin Pearce

Baron Bomine

Di Botcher

Older Nun

Eve Ponsonby

Orderly

Will Keen

Surgeon

Louise Brealey

Sexy Society Girl

Nicola Sloane

Housekeeper

Alistair Petrie

Chief Inspector

Neil Bell

Huntsman

Mark Gatiss

Dettweiler

Guillaume Delaunay

Prometheus 1

Robert J. Fraser

Livery Man (uncredited)

Valene Kane

Mrs. Winthrop (uncredited)

Adrian Schiller

Dr. Clive (uncredited)