Chandler returns to America to find out what has really been happening.
The crew makes a discovery; Chandler sees an opportunity to add another ship to the fleet.
The fight for America comes to an end. Chandler faces a challenge that could change his life forever.
Chandler and his crew face off against a nuclear-powered submarine led by British naval officers.
With Rachel close to a breakthrough on her vaccine, she, Chandler and XO Slattery lead a small team into the jungles of Nicaragua on a mission to find monkeys for her vaccine trials.
Chandler tracks the immunes to Northern Florida; Rachel comes across a secret formula.