Gary Oldman

as Herman Mankiewicz

Amanda Seyfried

as Marion Davies

Lily Collins

as Rita Alexander

Arliss Howard

as Louis B. Mayer

Tom Pelphrey

as Joseph Mankiewicz

Sam Troughton

as John Houseman

Ferdinand Kingsley

as Irving Thalberg

Tuppence Middleton

as Sara Mankiewicz

Tom Burke

as Orson Welles

David Fincher

Director