Characters played by Paul Newman
General Leslie R. Groves
Characters played by Dwight Schultz
J. Robert Oppenheimer
Characters played by Bonnie Bedelia
Kitty Oppenheimer
Characters played by John Cusack
Michael Merriman
Characters played by Laura Dern
Kathleen Robinson
Characters played by Ron Frazier
Peer de Silva
Characters played by John C. McGinley
Richard Schoenfield
Characters played by Natasha Richardson
Jean Tatlock
Characters played by Ron Vawter
Jamie Latrobe
Characters played by Michael Brockman
William 'Deke' Parsons
Characters played by Del Close
Dr. Kenneth Whiteside
Characters played by John Considine
Robert Tuckson
Characters played by Allan Corduner
Franz Goethe
Characters played by Joe D'Angerio
Seth Neddermeyer
Characters played by Jon DeVries
Johnny Mount