Sam Keeley
as Jack Calkin
Joel Basman
as Edward Teller
Ryan Gage
as Robert Oppenheimer
James Kelly
as Norris Bradbury
Esther Garrel
as Francoise
Mateusz Wieclawek
as Adam Ulam
Philippe Tlokinski
as Stan Ulam
Fabian Kociecki
as Johnny von Neumann
Alberto Ruano
as Carlos
Richard Mason
as George Dyson
Camille Moutawakil
as Mici Teller
Sally Cowdin
as Irene
Anne-Catrin Märzke
as Jacky
Philipp Christopher
as Henry Hitchens
Lucy Bromilow
as Molly