Last Resort (2012 - 2013)

More than 20 warships close in on the Colorado; as Kendal is forced into a battle on the ground, Prosser questions Marcus' judgement

Aa search for three missing crew members leads to Serrat's compound and an ominous demand. A clandestine meeting between Kylie and Admiral Shepard confirms that the fire order came through a back channel.

Marcus and Sam learn they have been charged with treason; a threat brews among the group; an old friend of Sam's visits Christine.

In an attempt to end the standoff on Sainte Marina, Marcus and Sam enter into tense negotiations with the U.S. Government. Meanwhile, when a critical system fails, Grace must take command of the Colorado on a perilous repair operation.

The crew is attacked by an unknown force unlike any other; Sam and Marcus race to save the sub and protect the island.

Sam and Marcus look for the traitor who stole the nuclear launch key; when Prosser disobeys orders, he starts a conflict he can't control; Grace and James try to defuse a dangerous situation.

Marcus brings the islanders and the members of the Colorado together for a feast in the spirit of Thanksgiving; Grace searches for the truth when an essential crew member is accused of a crime.

The crew waits for a visit from its families; Marcus must contemplate the unthinkable; the reason for the attack on Pakistan is revealed.

Sam and James depart the island in a daring rescue attempt. Back on the island of Sainte Marina, a Chinese diplomat arrives to make a deal with Marcus. With scarcity and a prison problem plaguing him, Marcus finds himself treading down a more treacherous path than he could have imagined.

Kylie works with Admiral Shepard to bring down the President, using evidence of what really happened in Pakistan.

A brutal battle for control leaves the Colorado vulnerable to capture by a third party with a manipulative plan.