On the brink of a geomagnetic solar storm, a team comprised of Britain's leading experts, crisis contingency planners and the most senior politicians assemble under the name COBRA (taken from its meeting place in Whitehall's Cabinet Office Briefing Room A) to guide the country through turbulent times. The high-stakes series follows the members of this team as they take on the disaster; their missteps, political conflicts, personal drama, friendships and wit play out against the backdrop of an unfolding national crisis.