Rachel and Chandler ask for six volunteers to participate in human trials of her vaccine, but the tests could be a living hell as the virus and the vaccine do battle inside their bodies. Meanwhile back in the States, Chandler’s wife and father are doing everything they can to keep their family alive.

Rachel is hard at work on a new, more efficient version of the cure while Alisha decodes a message found on a recovered cell phone.

Chandler's mission comes to a head as he prepares the final part of his plan. President Michener ponders the fate of his presidency.

The fight for America comes to an end; Chandler faces a challenge that could change his life forever.

Having lost their only lead, the crew of Nathan James continues their search for an item that could save the world. Chandler immerses himself in a mission for revenge.

The crew of Nathan James faces a threat that will test the limits of their Naval tactics and strategies.

After months of fighting, the crew of Nathan James must embark on a dangerous mission to secure important intel that could decide the fate of the war.

With a devastating hostage situation occurring back home, Chandler must devise the perfect plan to avoid losing everything.