In the final episode the race is on to find out who is going to release the flu. The gang track down Dobri Gorski to a police cell, where he tells them the names of the three people he trained to release the flu. A process of elimination leaves them ... (more)with Terrence, but they still have to find him. Wilson's new ruthlessness is unnerving - can he be trusted? And what will happen when Becky runs out of Thoraxin?

Alistair Petrie, David Calder, Emil Hostina, Emilia Jones, Ian McDiarmid, Paul Ready, Ruth Gemmell, Sacha Dhawan, Steven Robertson, Sylvestra Le Touzel