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1. Bölüm As the possibility of a solar storm affecting the UK mounts, the Prime Minister Robert Sutherland, his chief of Staff Anna Marshall, the Head of the Civil Contingencies Secretariat Fraser Walker and the Home Secretary Archie Glover-Morgan assemble the emergency committee “COBRA” in an effort to combat the situation.
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2. Bölüm With the nation in the full grip of the crisis and experiencing the worst blackout in the history of the UK, Sutherland and his team are forced to work around the clock to restore power. Meanwhile Anna reconnects with Edin, but this dalliance with her past love becomes more dangerous than she anticipates.
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3. Bölüm 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. But with the Prime Minister away, Archie’s incendiary comments on the dark underbelly of public mood threatens to cause more problems for everyone.
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4. Bölüm 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. Meanwhile, a new threat rears its head as public sentiment grows more turbulent.
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5. Bölüm With the nation sliding further and further towards anarchy, Rachel faces difficult questions about Ellie. Meanwhile, Fraser says goodbye to his father and grows closer to Francine. And as the influence of “People’s Justice” grows ever-powerful, Sutherland is forced to consider more extreme measures to retain control of the country.
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6. Bölüm As anarchy explodes on the streets and the nation is rocked with night upon night of rioting, Fraser and his team reach the endgame in their mission to get the lights switched back on in the Red Zone. Meanwhile, with his personal life imploding, Sutherland is forced to fight for his political life as Archie finally fires his first shots…