Cast
| Name | Character | Team | |
|---|---|---|---|
 |
Bryan Cranston | Dalton Trumbo | Hangin with Mr. Cooper |
 |
Diane Lane | Cleo Trumbo | Goutbreak |
 |
Helen Mirren | Hedda Hopper | Goutbreak |
 |
Elle Fanning | Nikola Trumbo | Hangin with Mr. Cooper |
 |
Louis C.K. | Arlen Hird | Unowned |
 |
John Goodman | Frank King | Goutbreak |
 |
Michael Stuhlbarg | Edward G. Robinson | Goutbreak |
 |
David James Elliott | John Wayne | Unowned |
 |
Roger Bart | Buddy Ross | Unowned |
 |
Mark Harelik | Ed Muhl | Unowned |
 |
John Getz | Sam Wood | Unowned |
 |
Alan Tudyk | Ian McLellan Hunter | Goutbreak |
 |
James DuMont | J. Parnell Thomas | Unowned |
 |
Richard Portnow | Louis B. Mayer | Unowned |
 |
Adewale Akinnuoye-Agbaje | Virgil Brooks | Unowned |
 |
Stephen Root | Hymie King | The Free Refills |
 |
Mattie Liptak | Chris Trumbo (Age 13-17) | Unowned |
 |
Dean O'Gorman | Kirk Douglas | Unowned |
 |
Garrett Hines | Andrew Hird | Unowned |
 |
Christian Berkel | Otto Preminger | Unowned |
 |
Dan Bakkedahl | Roy Brewer | Unowned |
 |
Toby Nichols | Chris Trumbo (age 6-10) (as Tobias McDowell Nichols) | Unowned |
 |
Dalton Trumbo | Himself (archive footage) | Unowned |
 |
Laura Flannery | Party Goer | Unowned |
 |
Madison Wolfe | Niki Trumbo (age 8-11) | Unowned |
 |
Johnny Sneed | Robert Stripling | Unowned |
 |
Rio Hackford | Reporter | Unowned |
 |
Dane Rhodes | Reporter | Unowned |
 |
Peter MacKenzie | Robert Kenny | Unowned |
 |
John Neisler | Jury Foreman | Unowned |
 |
Sean Bridgers | Jeff Krandall | Unowned |
 |
Meghan Wolfe | Mitzi Trumbo (age 6-8) | Unowned |
|
Becca Nicole Preston | Mitzi Trumbo (age 9-12) | Unowned |
|
Mark Harelik | Edward 'Ed' Muhl | Unowned |
|
Jaclyn Bethany | Starlet (uncredited) | Unowned |
|
Kate Kuen | Ethel (uncredited) | Unowned |
 |
Suzanne LaChasse | Showgirl (uncredited) | Unowned |
 |
Rhonda Laizer | Trumbo Friend (uncredited) | Unowned |
|
Veronica Parks | Showgirl (uncredited) | Unowned |
|
Anne Speed | Juror (uncredited) | Unowned |