When a Troubled individual unleashes a rotting plague inside the police station, the new Chief orders a quarantine... trapping Audrey and the others inside. Meanwhile, Duke confronts Evi about her betrayal of him.
Stephen Fry hosts the mind-expanding quiz in which the aim is to be interesting. Stephen plays I-Spy with Sandi Toksvig, Lee Mack, Jimmy Carr and Alan Davies.
At a remote facility outside Cape Town, Connolly closes in on his WMD prize, while Stonebridge and Scott are faced with dilemmas that could have far-reaching implications on their organization - and on the thread that connects them to Latif.
As the Torchwood team launch a final, desperate mission against the seemingly undefeatable Three Families, they realize it may come down to the ultimate sacrifice.