
Three years since a zombie virus swept America, there's only one person known to have survived the infection - the world's last hope at creating a vaccine. The last functioning viral lab needs blood from him for its antibodies, but the facility is in California and the man is in New York. A ragtag group of strangers works to transport him to the West Coast, but they don't know about his dark secret, which could threaten all. Hammond and his second in command, Garnett, lead the group of the living, and computer hacker Citizen Z helps everyone navigate the zombie-infested terrain.

The heroes break into Altura in an attempt to bring Pandora and Estes to justice; Cooper reappears, shocking Warren; there's something he has to tell her.

Warren and the others must free the Talkers being held in Quarantine and prepare to attack Altura.

With some help from an outpost of renegade hackers, Warren and George hack Altura's defenses and discover Estes' secret plan.

Altura militiamen force Talkers to mine a hazardous waste landfill for the secret ingredient to biscuits.