A deep cover operative awakens to find himself imprisoned on a submarine. With the help of a fellow prisoner and an amateur agent, he must race against the clock to escape the vessel and expose who set him up.

A team of highly skilled Navy SEALS find themselves embarking on the battle of their lives when they come face-to-face with the undead. After a deadly outbreak occurs in New Orleans, the SEALS must fight for their lives, and the city, against an army of zombies.