| Leonardo DiCaprio | Howard Hughes |
| Cate Blanchett | Katharine Hepburn |
| Kate Beckinsale | Ava Gardner |
| John C. Reilly | Noah Dietrich |
| Alec Baldwin | Juan Trippe |
| Alan Alda | Sen. Ralph Owen Brewster |
| Ian Holm | Professor Fitz |
| Danny Huston | Jack Frye |
| Gwen Stefani | Jean Harlow |
| Jude Law | Errol Flynn |
| Adam Scott | Johnny Meyer |
| Matt Ross | Glenn Odekirk |
| Kelli Garner | Faith Domergue |
| Frances Conroy | Katharine Martha Houghton Hepburn |
| Brent Spiner | Robert Gross |
| Stanley DeSantis | Louis B. Mayer |
| Edward Herrmann | Joseph Breen |
| Willem Dafoe | Tabloid editor |
| Kenneth Walsh | Dr. Thomas Norval Hepburn |
| J.C. MacKenzie | Ludlow Ogden Smith |
| Josie Maran | Thelma |
| Vincent Laresca | Jorge |
| Sam Hennings | Frank |
| Chris Ufland | Engineer |
| Justin Shilton | Test pilot |
During the 1930s and '40s, wealthy industrialist Howard Hughes gains fame as a movie producer, airplane designer and pilot.
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