Day One Cast and Crew
 Brian Dennehy - (Gen. Leslie Groves) |
 David Strathairn - (J. Robert Oppenheimer) |
 Michael Tucker - (Leo Szilard) |
 Hume Cronyn - (James F. Byrnes) |
| Richard Dysart - (Harry S. Truman) |
 Hal Holbrook - (Gen. George Marshall) |
| Jon Baggaley - (James Tuck) |
| David Bolt - (Harry Gold) |
| Peter Boretski - (Albert Einstein) |
| Lorne Brass - (Klaus Fuchs) |
 Patrick Breen - (Richard Feynman) |
 Tom Butler - (Captain DeSilva) |
| Bob Clout - (Alfred MacCormack) |
| Lawrence Z. Dane |
| Norris Domingue - (General Pa Watson) |
| David Ferry - (Army Major) |
| David Gow - (Jack Wisnovsky) |
| Roland Hewgill - (Army General) |
| Barnard Hughes - (Secretary Stimpson) |
| Olek Krupa |
| Bernie McInerney |
| John McMartin |
| Isabelle Mejias - (Mrs. Trowbridge) |
| Robert Morelli - (T.O. Jones) |
| Frederick Neumann - (Alexander Sachs) |
| Ken Pogue |
| Gary Reineke |
| Michael J. Reynolds - (Kenneth Bainbridge) |
| George R. Robertson - (Ed Condon) |
| Alan Scarfe |
 Tony Shalhoub |
| Michael Sinelnikoff - (Lord Rutherford) |
| Philip Spensley - (British Sr. Officer) |
| David Ogden Stiers - (FDR) |
| Scott Thomson - (Chemist) |
| Anne Twomey |
| Vlasta Vrana - (Hans Bethe) |
| Timothy Webber - (Colonel Lansdale) |
 Ron White |
| Jonathan Wise - (Robert Serber) |
| Ronald C. Frazier |
| John Seitz |
| Joe Cazalet - (Air Force Guard) |
| Stefan Balint - (Eugen Wigner) |
| Graham Haley - (Haakon Chevalier) |
| Francois Klanfer - (Haagen) |
| Terence Labrosse - (Allan Dulles) |
| George Popovich - (Samuel Goudsmit) |
| Dee McCaffrey - (William "Deke" Parsons) |
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