Gary Oldman
Herman Mankiewicz

Amanda Seyfried
Marion Davies

Lily Collins
Rita Alexander

Arliss Howard
Louis B. Mayer

Tom Pelphrey
Joseph Mankiewicz

Sam Troughton
John Houseman

Ferdinand Kingsley
Irving Thalberg

Tuppence Middleton
Sara Mankiewicz

Tom Burke
Orson Welles

Joseph Cross
Charles Lederer

Jamie McShane
Shelly Metcalf

Toby Leonard Moore
David O. Selznick

Monika Gossmann
Fräulein Frieda

Charles Dance
William Randolph Hearst

Adam Shapiro
George S. Kaufman

John Churchill
Charles MacArthur

Jeff Harms
Ben Hecht

Sean Persaud
Tommy

Paul Fox
Joe Von Sternberg

Tom Simmons
Doctor

Cooper Tomlinson
Younger Man

Julie Collis
Female Starlet

Arlo Mertz
Child Star

Craig Welzbacher
Rexford Tugwell

Jessie Cohen
Norma Shearer Thalberg

Desiree Louise
Irene Selznick

Amie Farrell
Mrs. Meyer

Lou George
Ed the Gate Guard

John Lee Ames
Grady

Bill Nye
Upton Sinclair

Richmond Arquette
Heckler

David Lee Smith
Sinclair Supporter

Mario Di Donato
A Man's Voice (voice)

Flo Lawrence
Maude Anderson

Sebastian Faure
Movie Star #1

Randy Davison
Maître D

Christian Prentice
Emcee

Leven Rambin
Eve - Shelly's Girlfriend

Rick Pasqualone
Singer

Mark Fite
James Wilson

John Patrick Jordan
Best Original Screenplay Announcer

Ben Mankiewicz
Broadcaster, Academy Awards

Natalie Denise Sperl
Movie Star #2

Brian Michael Jones
Aide - Ben

Camille Montgomery
Starlet #1

Paul Carafotes
Assistant Director

Anne Beyer
Female Party Goer

Sean Donnellan
Martin Butler

Stewart Skelton
News Reel I

Keith Barber
News Reel III

Kaytlin Borgen
Mayer's Assistant

Madison West
Starlet #2

Elvy
Starlet #3

Wylie Small
Wife #2

Cary Christopher
Young Joseph Mankiewicz (uncredited)

Kingston Vernes
Young Herman Mankiewicz (uncredited)

Jordan Matlock
Groundskeeper (uncredited)

Anthony Molinari
Hobo (uncredited)

Sebastian Twohey-Jacobs
Beach Goer (uncredited)