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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S05E01 Gas and Oil (Part 1)
September 17 · 52min find the promo
Show synopsis
The government introduces Draconian emergency measures in response to a series of terrorist attacks. MI5 fears that influential establishment figures are behind the attacks and may be planning a coup.
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S05E02 Gas and Oil (Part 2)
September 17 · 52min find the promo
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MI5 has foiled an attempt to murder the Home Secretary, but the plotters use the new emergency powers to imprison Harry. The team must try to frustrate the coup before Harry is executed.
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S05E03 The Cell
September 18 · 52min find the promo
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Zaf goes deep undercover to infiltrate an Al-Qaeda cell that is planning an attack on the UK. When Adam learns that the terrorists are on a suicide mission he tries to prevent them from reaching their target, but events soon spiral out of control.
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S05E04 World Trade
September 25 · 52min find the promo
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Posted undercover at the World Trade Summit for Africa, the team discovers an assassination plot. Initially determined to put their lives on the line to prevent the murder, they are faced with a moral dilemma on discovering the motive behind the plot.
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S05E05 The Message
October 2 · 52min find the promo
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The government publishes its report on the investigation into the death of seven terrorist suspects in a fire at a prison. Harry suspects a cover-up, then discovers that one of his team has been implicated.
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S05E06 Hostage Takers (Part 1)
October 9 · 52min find the promo
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Adam and Zaf try to find a group of terrorists who have infiltrated Britain. Ros oversees a visit by a delegation of Saudi princes offering a guaranteed oil supply in exchange for nuclear expertise, but the Saudi Trade Centre is attacked by terrorists.
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S05E07 Hostage Takers (Part 2)
October 16 · 52min find the promo
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The terrorists start to execute hostages in pursuit of their demand for the release of Al-Qaeda prisoners held in Saudi Arabia, but suspicion arises as to the true identity of the terrorists.
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S05E08 Agenda
October 23 · 52min find the promo
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MI5 investigates the assassination of a Muslim cleric outside the high court, and uncovers a radicalised Christian who is determined to incite a religious war.
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S05E09 The Criminal
October 30 · 52min find the promo
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MI5 is put in charge of protecting Niko Grecic, the former right-hand of Tezlia, a Serbian who is put on trial for war crimes. They know that Richard Dempsey, a former MI6 agent who turned on them, is looking for Grecic to kill him before he can testify. Adam, Jo and Zafar must protect Grecic at all costs.
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S05E10 Aftermath
November 13 · 52min find the promo
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An environmental terrorist group is threatening to flood London if the government does not make a secret document public.