Season 6 - Episode Guide

Adam and Zaf target a UK-bound terrorist with a train bomb in Tehran. As the operation goes catastrophically wrong, the team learn of the darker goals of theirmission and the influence of a mysterious external agent, with the repercussions of the Tehran blast felt on the streets of London.

The highly-contagious plague-like virus unleashed by the Tehran blast is on the streets of London and a wounded, infected Zaf has been captured, possibly alreadykilled. As the team races against time to stop the virus spreading, they corral and infect top international spies in a bid to discover a vaccine.

As the team fear reprisals against Iran following the revelation of their bio-weapons programme, a British plane is apparently hijacked and flown into a US air base. But after they visit the base and Ros iscaptured by the shadowy Yalta organisation, they discover the sordid extent of an international cover-up.

As an Algerian extremist escapes his home detention, the team fear he may be plotting a terror attack on US businesses in the UK.

Attempting to stop an Iranian nuclear deal in the UK, Adam is framed for the killing of a mugger, who turns out to be a journalist.

The team discover that Iran has acquired nuclear triggers, despite the efforts of MI5 and the CIA. Adam and Ros go to Tehran.

A group of white anti-Islamists storm a televised debate on a new peace deal between the US and Iran and take everyone hostage.

As the team discover the size and reach of the Yalta organisation, Ros desperately attempts to escape identification.

An old adversary of Harry's appears out of the woodwork to inform the team about a bomb he's planted in central London.

War with Iran finally averted, the team learn that a London school will be the target of hardliners resisting the new peace.