Frank Winter and his team have been recruited to work on a project even they could know nothing about it until their arrival.
A special shipment of the first sample of plutonium arrives at The Hill – one that could change everything.
As the news of Sid’s death reverberates through the compound, the base begins cracking down on security on The Hill.
Frank grapples with haunting memories from his past and his erratic behavior gets called into question.
Tensions between Charlie and Frank escalate after Charlie takes a public jab at Babbit’s past, raising red flags.
When Charlie is chosen to go on an important trip to Tennessee to see the country’s first plutonium reactor.
Helen and Charlie deal with a crisis; Abby embarks on a journey of self-discovery.
Charlie and Frank both face serious questions about the future of their projects.
The Implosion group overcomes another hurdle with help from Charlie's past. An unexpected visitor to The Hill raises suspicions about Frank.
A development overseas re-invigorates the hunt for a spy on The Hill.
Akley exposes himself when he tries to fix Thin Man's shortcomings.
Akley becomes vulnerable when he tries to fix Thin Man's shortcomings.
Frank is offered a life-changing opportunity; at the same time, the U.S. Army put Charlie on the hot seat.