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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S04E01 The Special (1)
September 12 find the promo
Show synopsis
When a devastating bomb explodes in central London, causing multiple deaths, a terrorist group with a hatred for human life claim responsibility. With their leader facing extradition, the bombers announce that crippling attacks will be launched at ten hour intervals until he is released.
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S04E02 The Special (2)
September 13 find the promo
Show synopsis
Zafar and Adam race against the clock to uncover the latest bomb. As a new ultimatum is issued and Tash mysteriously disapears, the team is forced to deal with the possibility of a mole within their own organisation.
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S04E03 Divided They Fall
September 22 find the promo
Show synopsis
Far-right political party The British Way is threatening democracy so Adam and Fiona go undercover to infiltrate and destroy its campaign.
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S04E04 Road Trip
September 29 find the promo
Show synopsis
Adam infiltrates a truck carrying illegal immigrants across Europe in order to stop a would-be terrorist.
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S04E05 The Book
October 6 find the promo
Show synopsis
A neo-conservative group murder an ex-minister to cover up his past and then they hunt down the journalist who is threatening to blow the story and is under MI5 protection.
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S04E06 The Innocent
October 13 find the promo
Show synopsis
MI5 suspect a terrorist is planning an attack from his prison cell. Guest stars Jimi Mistry.
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S04E07 Syria
October 20 find the promo
Show synopsis
The Syrian foreign minister tries to establish subversive contacts with MI5 at the opening of a cultural centre in London. Fiona is desperate to lead this mission and must confront her Syrian past.
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S04E08 The Russian
October 27 find the promo
Show synopsis
An old British traitor is called in to infiltrate a Russian firm suspected of stealing secrets from GCHQ.
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S04E09 The Sting
November 3 find the promo
Show synopsis
Harry upsets the CIA by stopping an extradition to the USA.
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S04E10 Diana
November 10 find the promo
Show synopsis
A former officer is convinced that MI5 killed Princess Diana and is determined to force the team to prove it.