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. While there, they find much more than they bargained for when they run across a former drug kingpin who will stop at nothing to maintain his stranglehold on his oppressed society. Chandler and his men find themselves in a huge moral dilemma over whether to eliminate this menace or take what they need and continue on with their mission.

Chandler tracks a new threat to Northern Florida. Meanwhile, Rachel comes across a secret formula that her mentor, Dr. Hunter, had been perfecting.

Chandler and crew race to find answers in an Asian Dodge City. Slattery begins to unravel the truth about his troubling predicament.

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 gets a lead that could help answer threatening questions. Kara does some digging in the White House.

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

Sixteen months after thwarting the coup in America, Nathan James must face yet another global disaster. The question remains, where in the world is Tom Chandler?

An undercover mission in the land of the dead leads to disturbing revelations about Dr. Vellek's sinister plans.

Three years after overcoming the global famine, the United States Navy is ready to unveil its first fully functional fleet since the Red Flu pandemic, but a new type of threat may mean the next world war.

Nathan James must seek the aid of a prominent rebel leader in order to create a staging area before mounting an invasion of their own.

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