Charlie is forced into a new leadership role in the race to build the world's first atomic bomb.

Frank wakes up in, and wanders around, an empty prison. He meets a mysterious prisoner who seems to be the only other person in the prison. He is subjected to all kinds of mind bending games before the truth of his situation is finally revealed. Written by Wayne

Liza faces off against Darrow as Abby learns a secret about Oppenheimer.

Frank's situation improves with unexpected aid. Oppenheimer's private life has unforeseen impact on project.

Frank tries to navigate his new place on The Hill.

The scientists and the Army battle for control of the bomb.

The hunt for a Soviet spy turns deadly.

As the project falters, Charlie turns to an unlikely partner for help.

Days before the world's first nuclear explosion, everyone races to secure their place in history.

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.