Nadine Lewington

While Lex attempts to maintain control outside the cordon, he learns that a young woman, who had close contact with an infected patient, is unaccounted for. With limited resources available, Lex is forced to enlist help from Jake, whose growing resentment towards Lex for getting him trapped inside is causing him to spiral. Elsewhere, Katie attempts to keep it together as she keeps a watchful eye over her students, while Teresa is devastated to learn that her friends may have been exposed to the virus. Finally, Jana, who has learned that her best friend Suzy (guest star Nadine Lewington) is also trapped inside the cordon, rations out their limited food as they wait out the 48-hour quarantine.

Cotton discovers life-altering news while Mary learns the power of her femininity.

Dr. Cannerts makes a major breakthrough that brings him one step closer to finding a cure for the virus. Meanwhile, after monitoring hospital surveillance from the day of the outbreak, Katie and Jake unravel the truth behind Patient Zero. Elsewhere, Jana and Suzy move forward with a plan to escape the cordon using the city's underground tunnel system. Finally, a risky operation to extract the potential antidote from the cordon takes an unexpected turn.

When Teresa goes into labor, Jana, Suzy and Sam (guest star Shawn Parsons) band together to turn Bitscan into a makeshift delivery room. Meanwhile, after spending some time with Dr. Lommers, Lex grows concerned after noticing a sudden shift in her behavior. Elsewhere, Leo continues to unravel the conspiracy behind the virus outbreak, while Jake stumbles upon some damning information about who may be involved. Finally, fed up with his lies, Katie confronts Dr. Cannerts.

In the series finale, Lex carefully plans his next steps — with only one shot to take Dr. Lommers down for good. Jana, Suzy, Teresa and Xander make their dangerous escape out of the cordon, but unexpected road blocks threaten to destroy their chance of making it home. Inside the cordon, Dr. Cannerts and Jake make a breakthrough discovery following a risky experimental treatment. Finally, with time running out, Lex is forced to make a decision that will change his life forever.