COBRA is assembled when fresh disaster strikes - a breach at Dover port means an insidious threat may be in play. As Sutherland is briefed by his team, the mission is set; intercept any trucks which made it through the breach, whilst avoiding mass panic.
As widespread power outages cause chaos and threaten lives across the country, the COBRA committee comprised of the UK's leading experts and politicians, gathers to find a way to turn the lights back on.