After the season 4 finale left most of the main characters at the mercy of the sadistic inhabitants of Terminus. Season 5 will offer new directions for the group of survivors as scientist Eugene Porter promises a cure to the zombie virus if he can be safely escorted to Washington DC, but getting there is easier said than done.
John Porter resigns from the SAS following the aftermath of a rescue mission in Iraq on the eve of the American led invasion in 2003, where two fellow soldiers were killed, apparently by a thirteen-year boy Porter had failed to kill, leaving him responsible. Seven years later, Porter is "reactivated" following the kidnap of journalist Katie Dartmouth by the same terrorists he fought seven years ago, including the same boy: As'ad.
An old gangster is advised that Freddie Mays would leave jail after thirty years in prison. His mood changes and he recalls when he was a young punk, who joined Freddie Mays' gang, a man he both envied and ultimately betrayed.