The countdown to the first nuclear weapon test goes on, as Frank Winter races to apprehend a Soviet spy who intends to sabotage the gadget. The scientists from the hill withdraw from the Trinity site to witness history being made.

Cast: Rachel Brosnahan, Michael Chernus, Christopher Denham, Katja Herbers, John Benjamin Hickey, Harry Lloyd, Olivia Williams, Ashley Zukerman, William Petersen, Peter Stormare, Daniel London, Jason Ralph, Griffin Dunne, Ben Hall, Miles Hall