Prime Minister Robert Sutherland, his Chief of Staff Anna Marshall and new Home Secretary Joseph Obasi assemble the emergency committee “COBRA” to respond to a potentially explosive situation in Kent.

Following devastation in Kent and the cyber-attack 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 try to understand the latest discovery, while Francine's attack on Lord Singer is met with delight by the Labour leader.

Reeling from the events in Kent, the COBRA team are briefed by Eleanor on the nature of a sophisticated malware which has infected the UK’s critical infrastructure.