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.
Written by Sophie and last updated on nov 28, 2022.
PS: The following content contains spoilers!
PPS: I will admit that parts of this page was written with the help of AI - it makes my work so much easier to not start from a blank page!
Saturday morning. Danny and Colin practice their firing technique on MI-5s gun range. Zoe and fiance 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...
The episode was rated 7.68 from 97 votes.
The baby of a celebrity couple is kidnapped and they call in MI-5. Fiona goes in undercover to gather more information about the couple against Adam's wishes.
The episode was rated 7.82 from 94 votes.
While a deadly hacker turns Britain upside down, Danny decides weather 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...
The episode was rated 7.82 from 100 votes.
The latest round of Middle East peace talks are abruptly halted when a key delegate is killed. With the peace process derailed MI5 start 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?
The episode was rated 7.86 from 110 votes.
Danny and the team must uncover the truth behind an assassination attempt on a famous novelist.
The episode was rated 7.87 from 101 votes.
Zoe is tried for manslaughter when an MI-5 operation results in the murder of an undercover police officer.
The episode was rated 7.91 from 103 votes.
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.
The episode was rated 7.92 from 106 votes.
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?
The episode was rated 8.03 from 95 votes.
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.
The episode was rated 8.19 from 103 votes.
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.
The episode was rated 8.23 from 107 votes.
