Sutherland and Marshall assemble the COBRA emergency committee to respond to a potentially explosive situation in Kent. Meanwhile, former Home Secretary Archie Glover-Morgan plots a return to power.
Following devastation in Kent and the cyberattack which continues to jam communications, the Prime Minister convenes an emergency COBRA meeting.
COBRA is assembled when fresh disaster strikes, as a breach at Dover port suggests an insidious threat; the PM's strategy is tested by an online activist.
The team tries to understand the latest discovery, while Francine's attack on Lord Singer is met with delight by the Labour leader.
Rachel is dismayed by the fresh assault on her reputation, but Robert is distracted following Firestorm's return; reports of a new cyberattack arrive.
Reeling from the events in Kent, the COBRA team learn of a sophisticated malware which has infected the UK's critical infrastructure.
Robert Carlyle
Prime Minister Robert Sutherland
Victoria Hamilton
Chief of Staff Anna Marshall
Richard Dormer
Fraser Walker
David Haig
Home Secretary Archie Glover
Lucy Cohu
Rachel Sutherland