J. Robert Oppenheimer
Self (archive footage)
Ellen Bradbury Reid
Self - Daughter of Los Alamos Scientist
Christopher Nolan
Self - Writer / Director, "Oppenheimer"
Jon Else
Self - Filmmaker, "The Day After Trinity"
Kai Bird
Self - Co-Author, "American Prometheus"
Bill Nye
Self - Science Educator
Richard Rhodes
Self - Author, "The Making of the Atomic Bomb"
Mareena Robinson Snowden
Self - Nuclear Security Expert
Alan B. Carr
Self - Senior Historian, Los Alamos National Laboratory
Gregg Herken
Self - Author, "Brotherhood of the Bomb"
Jennet Conant
Self - Author, "109 East Palace"
David Eisenbach
Self - History Professor, Columbia University
Alex Wellerstein
Self - Nuclear Historian
Martin J. Sherwin
Self - Co-Author, "American Prometheus" (voice)
Michio Kaku
Self - Theoretical Physicist
Leslie Groves
Self - Director, Manhattan Project (voice) (archive footage)
Charles Oppenheimer
Self - Grandson
Robert Christy
Self - Theoretical Physicist (voice) (archive footage)
Robert S. Norris
Self - Author, "Racing for the Bomb"
Hideko Tamura
Self - Hiroshima Survivor (Age 10)
Roy Glauber
Self - Scientist, Manhattan Project (voice) (archive footage)
Edward Teller
Self - Theoretical Physicist (archive footage)
Eleanor Roosevelt
Self (archive footage)
Judy Woodruff
Self (voice) (archive footage)
Adolf Hitler
Self (archive footage)
Vladimir Putin
Self (archive Footage)
Xi Jinping
Self (archive Footage)
Albert Einstein
Self (archive Footage)