J. Robert Oppenheimer

as Self (archive footage)

Ellen Bradbury Reid

as Self - Daughter of Los Alamos Scientist

Christopher Nolan

as Self - Writer / Director, "Oppenheimer"

Jon Else

as Self - Filmmaker, "The Day After Trinity"

Kai Bird

as Self - Co-Author, "American Prometheus"

Bill Nye

as Self - Science Educator

Richard Rhodes

as Self - Author, "The Making of the Atomic Bomb"

Mareena Robinson Snowden

as Self - Nuclear Security Expert

Alan B. Carr

as Self - Senior Historian, Los Alamos National Laboratory

Gregg Herken

as Self - Author, "Brotherhood of the Bomb"