| Person | Type | Job | Role(s) |
|---|---|---|---|
 Aaron Spelling | Crew | Production | Executive Producer |
 Benjamin Robin | Crew | Costume & Make-Up | Hairstylist |
Curtis A. Schnell | Crew | Art | Production Design |
David W. Rintels | Crew | Production | Producer, Teleplay |
Debra Karen | Crew | Editing | Editor |
E. Duke Vincent | Crew | Production | Executive Producer |
Guy Lalande | Crew | Art | Art Direction |
 Jocelyne Bellemare | Crew | Costume & Make-Up | Makeup Department Head |
 Joseph Sargent | Crew | Directing | Director |
Josette Perrotta | Crew | Production | Associate Producer, Unit Production Manager |
Kees Van Oostrum | Crew | Camera | Director of Photography |
 Ken Gord | Crew | Production | Executive In Charge Of Production |
 Mason Daring | Crew | Sound | Original Music Composer |
Michael A. Williams | Crew | Directing | First Assistant Director |
Renée April | Crew | Costume & Make-Up | Costume Design |
Ronald J. Rolfe | Crew | Costume & Make-Up | Assistant Hairstylist |
Sean Dwyer | Crew | Directing | Second Assistant Director |
Sylvain Arseneault | Crew | Directing | Third Assistant Director |
François Sylvestre | Crew | Production | Unit Manager |
Serge Morache | Crew | Costume & Make-Up | Assistant Hairstylist |
Gillian Chandler | Crew | Costume & Make-Up | Key Makeup Artist |
Norman Henry | Crew | Production | Production Manager |
Peter Wyden | Crew | Writing | Book |
Normand Bourgie | Crew | Directing | Third Assistant Director |
 Alan Scarfe | Cast | Actor | |
Alex Guard | Cast | Actor | British Jr. Officer |
 Anne Twomey | Cast | Actress | Kitty Oppenheimer |
 Arthur Holden | Cast | Actor | Scientist (uncredited) |
 Barnard Hughes | Cast | Actor | Henry Stimson |
 Bernie McInerney | Cast | Actor | |
Bob Clout | Cast | Actor | Alfred MacCormack |
 Brian Dennehy | Cast | Actor | Gen. Leslie Groves |
David Bolt | Cast | Actor | Harry Gold |
 David Ferry | Cast | Actor | Army Major |
 David Gow | Cast | Actor | Jack Wisnovsky |
 David Ogden Stiers | Cast | Actor | Franklin D. Roosevelt |
 David Strathairn | Cast | Actor | J. Robert Oppenheimer |
 Dee McCafferty | Cast | Actor | William 'Deke' Parsons |
Diana Fajrajsl | Cast | Ilse Polanyi | |
Ed McGibbon | Cast | William D. Leahy | |
Ester Spitz | Cast | Trude Weiss | |
François Klanfer | Cast | Actor | Haagen Kistiakowski |
Frederick Neumann | Cast | Actor | Alexander Sachs |
 Gary Reineke | Cast | Actor | Groves's Commanding Officer |
George Popovich | Cast | Samuel Goudsmit | |
 George R. Robertson | Cast | Actor | Ed Condon |
Graham Haley | Cast | Haakon Chevalier | |
 Hal Holbrook | Cast | Actor | Gen. George Marshall |
Heinar Pillar | Cast | Fleischmann | |
 Hume Cronyn | Cast | Actor | James F. Byrnes |
Joe Cazalet | Cast | Actor | Air Force Guard |
Joel Miller | Cast | George Kistiakowski | |
 John McMartin | Cast | Actor | Dr. Arthur Compton |
John Pielmeier | Cast | Actor | Seth |
 John Seitz | Cast | Actor | Ralph A. Bard |
Jon Baggaley | Cast | James Tuck | |
 Jonathan Wise | Cast | Actor | Robert Serber |
 Ken Pogue | Cast | Actor | Dwight D. Eisenhower |
Kliment Denchev | Cast | Actor | Michael Polanyi |
 Lawrence Dane | Cast | Actor | |
 Lia Sargent | Cast | Actress | Mrs. Wisnovsky |
 Lorne Brass | Cast | Actor | Klaus Fuchs |
Michael Farrell | Cast | Shapp | |
 Michael J. Reynolds | Cast | Actor | Kenneth Bainbridge |
Michael Sinelnikoff | Cast | Actor | Lord Rutherford |
 Michael Tucker | Cast | Actor | Leo Szilard |
Nicholas Kilbertus | Cast | Actor | Paul Tibbets |
Norris Domingue | Cast | Actor | General Pa Watson |
 Olek Krupa | Cast | Actor | Edward Teller |
 Patrick Breen | Cast | Actor | Richard Feynman |
Peter Boretski | Cast | Actor | Albert Einstein |
Philip Spensley | Cast | Actor | British Sr. Officer |
 Richard Dysart | Cast | Actor | President Harry S. Truman |
Robert Morelli | Cast | Actor | T. O. Jones |
 Roland Hewgill | Cast | Actor | Army General |
 Romano Orzari | Cast | Actor | Leo Szilard's Prime Scientist (uncredited) |
 Ron Frazier | Cast | Actor | Colonel Pash |
 Ron White | Cast | Actor | Colonel Nichols |
 Scott Thomson | Cast | Actor | Chemist |
Stan Gibbons | Cast | John J. McCloy | |
Stephan Balint | Cast | Eugen Wigner | |
Steve Barry | Cast | Los Alamo Scientist (uncredited) | |
Terrence Labrosse | Cast | Actor | Allan Dulles |
 Timothy Webber | Cast | Actor | Colonel Lansdale |
 Tom Butler | Cast | Actor | Captain DeSilva |
 Tony Shalhoub | Cast | Actor | Enrico Fermi |
 Vlasta Vrana | Cast | Actor | Hans Bethe |
 Harry Strandjofski | Cast | Actor | Robert Wilson |
 Isabelle Mejias | Cast | Actress | Mrs. Trowbridge |
Delise Alison | Cast | London Pedestrian | |
| Person | Type | Job | Role(s) |
