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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S03E01 Project Friendly Fire
October 11 · 52min find the promo
Show synopsis
Tom Quinn has disappeared after shooting his boss Harry Pearce. He also stands accused of assassinating the Chief of Defence Staff. Chairman of the Joint Intelligence Committee Oliver Mace uses this a pretext to launch a punitive investigation of MI5. Zoe, Danny and the team must prove Tom innocent and save the service from government takeover.
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S03E02 The Sleeper
October 18 · 52min find the promo
Show synopsis
Harry reawakens sleeper agent Fred Roberts, a renowned chemist and family man. As Fred becomes more deeply involved with deadly terrorists, Tom has a crisis of conscience which could jeopardise his career.
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S03E03 Who Guards the Guards?
October 25 · 52min find the promo
Show synopsis
Danny and the team must uncover the truth behind an assassination attempt on a famous novelist.
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S03E04 A Prayer for My Daughter
November 1 · 52min find the promo
Show synopsis
The latest round of Middle East peace talks are abruptly halted when a key delegate is killed. With the peace process derailed MI5 starts to investigate a newspaper mogul and renowned Israeli extremist, and a group he's associated with called the November Committee. Can MI5 prevent an assassination attempt on a pro-Palestinian British MP?
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S03E05 Love and Death
November 8 · 52min find the promo
Show synopsis
Saturday morning. Danny and Colin practice their firing technique on MI5's gun range. Zoe and her fiancé Will are still madly in love. Ruth watches old movies at home whilst longing for real-life romance. A North Sea mission places additional stain on all relationships...
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S03E06 Persephone
November 15 · 52min find the promo
Show synopsis
Zoe is tried for manslaughter when an MI5 operation results in the murder of an undercover police officer.
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S03E07 Outsiders
November 22 · 52min find the promo
Show synopsis
While a deadly hacker turns Britain upside down, Danny decides whether to reveal all to Will, MI5 hunts the source down to an Islamic mosque with the help of MI5's best computer programmers. But things get suspicious when Ruth, close onto the tail of the hacker, goes missing and so does a member of the special team...
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S03E08 Celebrity
November 29 · 52min find the promo
Show synopsis
The baby of a celebrity couple is kidnapped and they call in MI5. Fiona goes in undercover to gather more information about the couple against Adam's wishes.
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S03E09 Frequently Asked Questions
December 6 · 52min find the promo
Show synopsis
When known mercenary Robert Morgan is spotted at a top-secret disused Soviet arms dump, he obviously has to be brought in for questioning. Is it all right to blackmail innocent people to get the information you want? Is it acceptable to threaten the lives of a suspect's family?
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S03E10 The Suffering of Strangers
December 13 · 52min find the promo
Show synopsis
It's Fiona's birthday, and she's not going to forget it! While inspecting a possible Islamic terrorist safe house, they are kidnapped. With the threat of his son's, his wife's and Danny's life, Adam must choose who won't live to see another day, Fiona or Danny? The prime minister's life is in danger. Will MI5 give into the kidnappers demands? But then to everybody's surprise... Danny makes the ultimate sacrifice.