Issa and her new man tread awkward waters at a work-related social event. Meanwhile, Molly juggles multiple suitors, and Issa plays defense against online attacks about her business.

Chandler returns to America to find out what has really been happening.

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

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.

Nathan James finds itself trapped between the submarine and civilian blockades.

Chandler must find a way to return to his old crew and investigate a dangerous new foe.

Chandler must confront his suspected new foe. Slattery learns more about the supposed virus mutation. Pressure mounts on President Michener as the situation worsens.

Chandler’s mission becomes complicated as his position is worsened. President Michener faces pressure from the regional leaders.

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 Nathan James must evade an overwhelming threat. A revelation in St. Louis puts President Michener in a terrible position.

America copes with tragedy while Chandler further investigates the possible virus mutation.

Chandler faces his powerful enemy in a final showdown. Kara joins someone that can help with her mission.

The crew of Nathan James discovers that hospital ship USNS Solace was sent to sea to wait for Dr. Scott’s cure. Captain Chandler sees an opportunity to add another ship…

With a small group of survivors from Solace in tow, Chandler and his crew square off against an enemy of the most dangerous kind – a nuclear-powered submarine led by…

Nathan James is diverted from their mission when they receive a suspicious distress call from a fishing trawler.

With an enormous storm on the horizon, Nathan James must navigate an equally terrifying threat in order to make it to safety.

The search continues with a reconnaissance mission but things turn violent when an old foe resurfaces.

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

Chandler confronts his enemy — and his personal demons — in a final showdown, with the fate of humanity on the line.

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.