The fractured team join together with an underground resistance. Meanwhile, an imprisoned Rachel tries to help the sick as doses of the cure run low.
S02E02 - Fight the Ship
The new alliance between the rebels and the crew of the Nathan James makes an attempt to rescue Dr. Scott from the Avocet headquarters. The crew back at the ship makes an attempt of their own to regain control of the Nathan James.
S02E03 - It's Not a Rumour
The Nathan James returns home to Norfolk in a mission to distribute the cure. Meanwhile, Chandler sends his crew out to search for their loved ones and friends.
S02E04 - Solace
Chandler sees an opportunity to add another vessel to the fleet when a hospital ship is discovered at sea waiting for Dr. Scott's cure. But tensions rise when Chandler and his team board the ship, only to face an unforeseen enemy.
S02E05 - Achilles
Chandler and his crew duel against rogue British naval officers manning a nuclear-powered submarine. Meanwhile, Slattery interrogates a mercenary to learn more about a hospital ship, and a dangerous game of cat-and-mouse ensues.
S02E06 - Long Day's Journey
Chandler tracks the Immunes to Northern Florida in a bid to avenge the destruction of the labs. Elsewhere, Rachel unearths a secret yet incomplete cure formula, and Chandler's team locates an Immune compound controlled by Sean and Ned.
S02E07 - Alone and Unafraid
Chandler and his team infiltrate an Immune compound. Danny poses as one of Ned's workers and discovers that Patient Zero is working for the Ramseys. Meanwhile, Chandler inches into Sean's inner circle.
S02E08 - Safe Zone
Chandler tries to gain intel and reverse the brainwashing suffered by Michener. Also: Rachel attempts to construct Dr. Hunter's lost formula while wrestling with the knowledge that her bitter enemy is now on board the Nathan James.
S02E09 - Uneasy Lies the Head
Chandler and his team set out to find supplies and materials for Dr. Scott's lab, only to tangle with bounty hunters and the Immunes. Meanwhile, Rachel's effort to find a spreadable cure depends on the scientist who nearly erased mankind.
S02E10 - Friendly Fire
A suspicious death on the ship leads Chandler to launch a murder investigation, jeopardizing order and discipline on the vessel. Meanwhile, Rachel works on a more efficient cure, Alisha decodes an Immune message, and the ship heads to New Orleans.
S02E11 - Valkyrie
Ramsey broadcasts a message implicating the Navy in a disaster, as Chandler works to regain the trust of the American people. Meanwhile, the ship locates the source of the Immunes' signal, leading to a vicious battle with Ramsey's civilian allies.
S02E12 - Cry Havoc
The ship gets trapped between a blockade and a formidable sub. Chandler tries to protect Dr. Scott and the cure by removing them from the ship as an unavoidable showdown with the sub draws near.
S02E13 - A More Perfect Union
The President sends out a call to surviving Americans that the USS Nathan James will make port in a couple of places to spread the cure to the public. But the Immunes hear the call as well and turn up as Navy men.