Cobra Cyberwar, Episode 4

An explosive season two premiere. Prime Minister Robert Sutherland, his Chief of Staff and new Home Secretary, assemble the emergency committee "COBRA" to respond to a potentially volatile situation in Kent.

Following the devastation in Kent and the cyber-attack which continues to jam communications, the Prime Minister convenes an emergency COBRA meeting. MI5 Head Eleanor James suggests Russia is involved.

COBRA is assembled when a fresh disaster strikes - a breach at Dover port. Meanwhile, Chris Edwards urges Francine Bridge to run in the Kent by-election, capitalising on the disaster-ridden region.

Following the latest shocking discovery, the team scrambles to understand its meaning. Concerned by Firestorm, Eleanor reports a sharp rise in online threats against those assembled at the morning's COBRA.

Rachel Sutherland is dismayed by the fresh media assault on her reputation, but Robert is distracted - for somehow, Firestorm is back, and spreading misinformation about the water supply.

A thrilling finale. Reeling from the events in Kent, the COBRA team are briefed on the nature of a sophisticated malware which has infected the UK's critical infrastructure that could have devastating consequences.