Cobra

A frenetic season premiere. As the possibility of a solar storm affecting the UK mounts, the Prime Minister Robert Sutherland, assembles the emergency committee "COBRA" in an effort to combat the situation.

With the nation in the full grip of the crisis, Sutherland and his team are forced to work around the clock to restore power. Meanwhile, Anna reconnects with Edin, which becomes more dangerous than anticipated.

As the country continues to face darkness, Sutherland, Anna, Fraser and their teams pay a visit to the worst affected area in Northumberland to see the situation on the ground.

As questions are asked about Sutherland's knowledge of his daughter's involvement in her friend's death, Anna seeks the help of Eleanor in handling the new revelations about Edin.

With the nation sliding further and further towards anarchy, Rachel faces difficult questions about Ellie. As the influence of "People's Justice" grows ever-powerful, Sutherland must consider more extreme measures.

Everything comes to a head in this thrilling finale. As anarchy explodes on the streets, Fraser and his team reach the endgame in their mission to get the lights switched back on in the Red Zone.