Tense drama series about the different challenges faced by the British Security Service as they work against the clock to safeguard the nation. The title is a popular colloquialism for spies, and the series follows the work of a group of MI5 officers based at the service's Thames House headquarters, in a highly secure suite of offices known as The Grid.
Where to watch
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Amazon Prime Video
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Peacock Premium
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Philo
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Britbox
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Peacock Premium Plus
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Fawesome
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The Roku Channel
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Pluto TV
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Amazon Prime Video Free
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Tubi TV
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Amazon Video
see all options Availability data: JustWatch
- Seasons
- 10
- Episodes aired
- 86
- Latest aired
- S10E06
- Total runtime
- 1d 12h
Timeline when each season aired
- Season 1 May 2002 – June 2002 6 episodes
- Season 2 June 2003 – August 2003 10 episodes
- Season 3 October 2004 – December 2004 10 episodes
- Season 4 September 2005 – November 2005 10 episodes
- Season 5 September 2006 – November 2006 10 episodes
- Season 6 October 2007 – December 2007 10 episodes
- Season 7 October 2008 – December 2008 8 episodes
- Season 8 November 2009 – December 2009 8 episodes
- Season 9 September 2010 – November 2010 8 episodes
- Season 10 September 2011 – October 2011 6 episodes
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S06E01 The Virus: Part 1
October 16 · 55min find the promo
Show synopsis
Zaf and Adam participate in a mission in Tehran that goes wrong. As the investigation advances, the team realizes they've been lied to as to the goals of their mission.
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S06E02 The Virus: Part 2
October 16 · 55min find the promo
Show synopsis
The country faces a plague outbreak. In a race against time, the officers from Section D have to track down and quarantine everyone who might be infected, while preventing a panic.
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S06E03 The Kidnap
October 23 · 55min find the promo
Show synopsis
A British plane is thought to have been hijacked and taken to an American airstrip. Ros is captured by the Yalta organisation when the team shows up and they learn of an international cover-up.
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S06E04 The Extremist
October 30 · 52min find the promo
Show synopsis
As an Algerian extremist escapes his home detention, the team fears he may be plotting a terror attack on US businesses in the UK with the help of local Iranians. However, working with the Americans to stop the attack proves a trying task given their recently-deceitful behaviour.
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S06E05 The Deal
November 6 · 52min find the promo
Show synopsis
MI5 has to intercept a Russian arms dealer who plans to pass blueprints for a nuclear device to Iran. Adam and Ana decide to bring their relationship to a close.
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S06E06 The Courier
November 13 · 50min find the promo
Show synopsis
Harry discovers there's a mole at large in the Grid. Meanwhile, Ros and Adam board a plane undercover in an attempt to stop Iran becoming a nuclear power.
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S06E07 The Broadcast
November 20 find the promo
Show synopsis
A live TV broadcast announcing the new peace accord between the UK, US and Iran is hijacked by armed gunmen. Can Adam and Ros defuse the situation before someone's hurt?
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S06E08 Infiltration
November 27 find the promo
Show synopsis
Ros is in grave danger after Bob Hogan discovers she's a traitor. Meanwhile, Harry's brought before Yalta's chief, whose identity shocks him to the core.
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S06E09 Isolated
December 4 find the promo
Show synopsis
The team finds themselves suspended from the Grid following what happened involving Ros. Harry learns from an old adversary about a bomb he has planted in London. The team realizes that if they respond their lives will be in danger but if they don't it will be the public who suffers. A shocking discovery is made when they discover who is behind the latest threat.
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S06E10 The School
December 18 find the promo
Show synopsis
Hardliners opposed to the peace between Iran and the West have targeted a London school. Jo is captured by Redbacks, the mercenaries who abducted Zaf.