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2002
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2003
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2009
Original Air Date—13 May 2002
Twenty high-explosive devices are smuggled into England. When the first goes off killing a doctor and severely injuring her young daughter, the team scrambles to track down an American anti-abortion activist who snuck into the country - and may be planning a huge commemoration of her husband's execution back home in just a few days. Things are complicated by CIA insistence that the woman, if found, be extradited back to Florida, where she too will face the death penalty. |
Original Air Date—20 May 2002
Racial tensions in Britain continue to rise and the team pieces together an organized attempt to stir up problems for political gain. Tom and Helen go undercover to get close to the well-protected head of the conspirators. But as time runs short, personal loyalties will leave one team member dead. |
Original Air Date—27 May 2002
Zoe is undercover on a routine op, pretending to be a PR agent hoping to land a contract with the Turkish government. She winds up a hostage - along with dozens of others - when a group of Kurds take over the Turkish embassy and demand the release of political prisoners. However, the team pieces together that this is just a cover, as a disgruntled former spook is using kidnapping and terrorism to gain access to a secret bank account - one with millions of pounds... and the personal identities of every undercover officer. |
Original Air Date—4 June 2002
During riots in advance of US President Bush's visit to London, the MI-5 team observe Peter Salter among the agitators. Salter is a legendary agent and neither Zoe or Danny are quite sure what to do. When they report what they saw to Harry Pearce, he instructs them to remove any reference to Salter from their reports and to forget what they saw. Turns out Harry is running Salter on a special op in cooperation with MI-6. They are trying to nab a well known anarchist who is in the UK to stir up trouble. As the investigation progresses however, Salter's loyalty is called into question. Zoe has another problem when she suspects Tessa of embezzling funds. Tom meanwhile finally has to admit to Ellie what he really does for a living. She doesn't take it all well and she insists that he tell her daughter Maisie the truth or she will leave him. |
Original Air Date—10 June 2002
A former MP, imprisoned years before in an arms-dealing scandal, claims to have a damaging memoir ready to go to press. The team tries to determine whether its claims are genuine while possibly being subverted by other agencies with other agendas. |
Original Air Date—17 June 2002
SPOILERS Patrick McCann, the leader of an Irish splinter group walks into a safe house and insists that he has crucial information for MI5 concerning their investigation on an Middle East terrorist group called Asabiyah. To share in-depth information on Asabiyah's plan to hit a British nuclear power station with MI5, McCann requests that his group goes unwatched for 30 hours. Despite doubts about this collaboration, McCann's splinter group is granted their request of not being watched for 30 hours. It then becomes evident, however, that McCann has planned to release a bomb on one of London's stations which can be repelled by MI5 just in time. In the meantime, things get more serious between Ellie and Tom as she and her daughter Maisie move into Tom's house. When Tom brings his laptop to his home, he realizes too late that it is set up with a bomb and Ellie and Maisie are in great danger. |
Original Air Date—2 June 2003
As Republican nationals make several strikes in London, another bombing at a secret military installation catches the team's eye. Special Branch tracks the entry of a Serbian war criminal while a military convoy is attacked - and the exiles responsible stockpile enough arms to start a small war. While Tom keeps trying to make things right with Ellie, he and the team race to discover their enemy's final target. |
Original Air Date—9 June 2003
An extremist mullah may be planning England's first suicide bombing. MI5's mole is discovered and tortured, leaving the team in need of someone who can get deep inside the mosque. A former Algerian spy smuggles himself into the UK and offers to help - but his loyalties are questioned by Tom. As the mole gets closer and closer, he falls out of contact with the team, leading to a dramatic showdown in a schoolyard - with one child wearing a bomb. |
Season 2, Episode 3: SpidersOriginal Air Date—16 June 2003
Repeated attacks on MI5's computer system threaten the theft of virtually all classified information. Danny is undercover as a journalist for an socialist paper linked to an anarchist group while Zoe takes a turn as a middle school teacher to get close to another instructor who may be spearheading the computer attacks. Moreso than other episodes, though, everything is not as it seems as a long-dead agent and a potential nuclear device at the school play into a web of deceit and confusion that nearly costs MI5 all their secrets. |
Original Air Date—23 June 2003
Twenty billion in US aid has disappeared from Russia. Meanwhile, MI5 is called in to deal with the theft of a billion dollars from a well known bank - that also handles government accounts. A former KGB officer turned Mafioso is pulling strings in the bank - and possibly in the government - to launder the cash. Danny goes undercover as a commodities trader to find out what the bank and the chancellor's office aren't telling the team. Meanwhile Danny's relationship with the doctor continues to develop, and Zoe gets a pleasant surprise - and then a nasty shock - about her banker beau. |
Original Air Date—7 July 2003
A routine MI-5 training exercise to handle external calamities turns sinister when the team finds out that the threat is real and that a deadly biochemical weapon may have wiped out the government and most of south London. Amid the chaos, the team has to cope with the situation in the midst of a near total communications blackout. |
Original Air Date—14 July 2003
The American president's unexpected visit to London forces the MI5 and CIA teams to work together. Harry suspects that there is more to the surprise visit of the American President than the Americans admit to. After some investigations on MI5's part, Harry's instincts are confirmed: the plans of the American President involve a secret meeting between him and the Libyans. After Tom's break-up with Vicky, he is meanwhile facing difficulties from his former girlfriend's revenge plan to hurt Tom. |
Season 2, Episode 7: Clean SkinOriginal Air Date—21 July 2003
A French scientist Jerome Durand, has created an air burst EMP missile that when detonated, will shut down all electronic equipment within a square mile. He's now believed to be in London working with a British financier, Frank Hastings, on a possible sale of the new system. The French DGSE send an agent, Jean-Luc Goyon, to work with MI-5 but the British government plans to steal the system before it can be sold to anyone. When Harry Pearce's house is burgled by a gang of professional thieves, they also happen to get away with a briefcase of particularly sensitive information including stolen codes. He's not keen on reporting it so he and Tom set out to get it back. However one of the thieves, 14 year-old JJ, has a photographic memory and knows the information by heart. But perhaps JJ can be of use to them in stealing the missile plans. |
Original Air Date—28 July 2003
Due to a rail strike, the transportation of a load of nuclear waste has to be done by road. Zoe's task is to make sure that the transportation of nuclear waste reaches its destination safely. MI5 receives evidence that a discontented army officer is planning to lead the armed services in a mutiny. Tom is sent to investigate undercover but is convinced he is wasting his time. When Danny arrives to release Tom from the task, his cover is blown and it becomes clear that Major Curtis has attached explosives to the nuclear waste that is being transported by road. |
Original Air Date—4 August 2003
The Chala Cartel, a Columbian criminal organization dealing with drugs and weapons, are the focus of MI5 this time. Trying to get into the country, Chala Cartel kill 8 members of custom. In order to get to the core of Chala Cartel, Tom and Zoe start liaising with the leader's girlfriend Mariella. |
Original Air Date—11 August 2003
Harry finds out that Tom and Christine Dale, a CIA officer, are having a relationship. Tom ignores Harry's demands to end his relationship with Christine. Tom learns that an American assassin has come to Great Britain. This news was not passed on to MI5. Tom doesn't want to compromise Christine, so he is unable to tell Harry what he knows. On Tom's demand Danny and Zoe - without Harry's knowledge - take on the matter but things turn out badly. Tom's strange behavior and the set-up against Tom make him appear suspicious. Zoe and Danny believe that Tom might have gone bad. No one believes him, so Tom has to flee when he is accused of murder and conspiracy. |
Original Air Date—11 October 2004
After shooting Harry, Tom disappears once again. Evidence clearly speaks against him. Oliver Mace, chairman of Joint Intelligence Committee, seizes the opportunity of the fiasco to take over MI5 and overrule Harry's leadership. An investigation into the entire MI5 office takes place while the entire team is under constant watch. To fill the gap that Tom as a senior officer has left, Adam Carter, an MI6 officer, is recruited by Harry to help out MI5. |
Original Air Date—18 October 2004
The discovery of a nuclear lab in suburban England prompts Harry to activate a long-quiet sleeper agent, a university professor who must sacrifice, albeit temporarily, his name and maybe even his family to trick terrorists into thinking he's created red mercury, a highly efficient chemical detonator. As the op progresses, Tom begins to doubt the wisdom of shaking the sleeper's life to the ground and tries to get the mission scrubbed. |
Original Air Date—25 October 2004
An attack on an Islamic dissident author in his friend's bookstore puts MI-5 on the trail of international terror groups. Danny is assigned to protect the bookseller as Adam thinks he may still be a target. MI-6 isn't being of help and to the point of Adam having to stage an elaborate, hours-long shake of many tails in order to meet with a very highly placed source. In the post 9-11 world, no one is off limits, sides change quickly - and the team certainly isn't being told everything. |
Original Air Date—1 November 2004
When Patricia Norton, the UN's Chief Middle East Peace negotiator vanishes and is presumably kidnapped in the middle of important pre-peace conference negotiations, MI-5 go into action. Norton is well-known to Adam Carter and his wife Fiona who is an MI-6 agent. Adam believes a group known as the November Committee is at the center of the kidnapping as they are out to stop any possible negotiated solution. For Harry Pearce, he also has to worry about his daughter Patricia Townsend, a documentary filmmaker who is now supporting a pro-Palestinian faction. With both Zoe and Danny at the pro-Palestinian Committee, they discover that they are not the only ones there undercover. Zoe's photographer boyfriend, Will North, asks her to marry him. |
Original Air Date—8 November 2004
Through a series of exigent circumstances, Danny and Zoe are tasked with having to kill a scientist that is on the verge of selling a weaponized version of bubonic plague to North Korea and escaping the country. This is their first time at having so directly a hand in this aspect of their work, will a crisis of conscience allow the scientist to escape? |
Season 3, Episode 6: PersephoneOriginal Air Date—15 November 2004
Zoe is put on trial for using sex to entrap a suspect. She is convicted and sentenced to 10 years in prison. |
Season 3, Episode 7: OutsidersOriginal Air Date—22 November 2004
A series of cyber-terror attacks on pharmaceutical manufacturing, banks, and even traffic lights are sending Britain into a panic. While the national intelligence coordinator puts on a happy face, MI-5 bunkers down to try and track those responsible. But it's unclear if Islamic fundamentalists or simple greed are behind the growing body count and a ransom demand in diamonds puts a team member at risk. |
Season 3, Episode 8: CelebrityOriginal Air Date—29 November 2004
When the infant child of a fading but recently knighted rock star is kidnapped from his home, the Government wants MI-5 rather than the police to take charge of the investigation. Harry Pierce isn't very pleased but Oliver Mace let's him know in no uncertain terms that the decision comes from the highest authority. With Adam Carter in charge of the team and keeping the family under nearly constant surveillance, they decide to put someone in undercover to learn what they can. Adam isn't too pleased when he learns that his wife Fiona will come over on loan from MI-6 for the job. Meanwhile, Harry has other issues to deal with when a senior Government minister's sexual escapade goes wrong leaving the woman dead. |
Original Air Date—6 December 2004
When soldier of fortune Robert Morgan is caught digging up weapons in what was an old Soviet arms stash, he is turned over to MI-5 for questioning. The security agents determine that a sophisticated laser, used for guiding missiles to their target, is missing from the stash and they are convinced there is a terrorist plot underway. Adam is put in charge of interrogating Morgan and with no more than an estimated 48 hours before the attack, Adam finds himself unable to extract any information using conventional methods. Gradually, he begins to use so-called aggressive techniques bringing into question just how far they are prepared to go to get the information they need. Harry Pearce meanwhile has been short-listed for the soon to be vacant MI-5 Director-General position and prepares for his interview. |
Original Air Date—13 December 2004
After the police raid a house and find evidence that terrorists may be planning an attack in London with Sarin gas, Danny and Fiona Carter, who has now transferred to MI-5 from MI-6, follow up on a lead provided by an informant. It's a trap however and Fiona is soon forced to call husband Adam and under threat of her being killed, is forced to meet one of the terrorists. It's clear that whatever the terrorists are planning, it is related to that day's summit meeting between the British PM and Iraqi and US allies. While Adam tries to find out where Danny and Fiona are being kept, the prisoners are under constant threat with Fiona being threatened with being burned alive for all to see. As the threat increases, one of the two prisoners will not survive. |
Original Air Date—12 September 2005
As the team buries their dead colleague, a bomb goes off in a nearby market. The group, Shining Door, demands the release of their leader Michael Monroe or they will detonate another bomb in 10 hours. The CIA is involved since Shining Door has primarily directed its wrath at the US and Monroe is an American citizen. The group believes that mankind is a parasite destroying the Earth with its technology and believe that it will be destroyed unless humans are dramatically culled. Harry Pierce is less than pleased when a colleague, Juliette Shaw, suddenly re-appears and is appointed to help out given Fiona Carter's absence. She makes sure that what she knows about Harry's past will ensure a meaningful role for her. An ambush where a suspect is shot through the head tells Adam they have a mole in their midst. Their problems are compounded when one of the agents is taken prisoner. |
Original Air Date—13 September 2005
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Original Air Date—22 September 2005
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Season 4, Episode 4: Road TripOriginal Air Date—29 September 2005
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Season 4, Episode 5: The BookOriginal Air Date—6 October 2005
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Original Air Date—13 October 2005
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Season 4, Episode 7: SyriaOriginal Air Date—20 October 2005
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Original Air Date—27 October 2005
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Season 4, Episode 9: The StingOriginal Air Date—3 November 2005
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Season 4, Episode 10: DianaOriginal Air Date—10 November 2005
Angela Wells, a highly-regarded retired agent, presents evidence that the British government assassinated Princess Diana. Rebuffed, she holds MI-5 hostage in lock down and gives them a deadline to prove it, but does she have a secret agenda? |
Season 5, Episode 1: OneOriginal Air Date—17 September 2006
Terrorists carry out several devastating attacks on British targets which lead to panic and new extreme legal measures being rushed through Parliament, but is there more to this than meets the eye? |
Original Air Date—17 September 2006
While Juliet has to come to terms with her injury, MI5 begin to unravel a conspiracy which sees an elite group trying to take control of Britain. They eventually see that this goes much further than anyone expects. |
Original Air Date—18 September 2006
Intelligence suggests that a thermobaric bomb is being sold to terrorists. Using Zaf as an insider, section D look to intercept the bomb before it does irreparable damage to London, but things don't go exactly to plan. |
Original Air Date—25 September 2006
During a world conference which could signal the end of poverty in Africa, MI5 uncover two conspiracies which threaten an individual life and world relations. Is anyone using the conference for its intended purpose? |
Original Air Date—2 October 2006
Ruth is witness to a stranger killing himself in a subway station and is led to a series of clues which will change her world forever. |
Original Air Date—9 October 2006
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Original Air Date—16 October 2006
A group of terrorists take the occupants of the Saudi-Arabian trade centre hostage threatening to kill one person every hour until their demand for the release of certain prisoners within Saudi-Arabia are met. Luckilly Ros is already in the building. Will the Saudi-Arabian king give in to the demands? What nationality are the terrorists? |
Original Air Date—23 October 2006
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Original Air Date—30 October 2006
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Original Air Date—13 November 2006
An environmental terrorist group storm the Thames Barrier and threaten to flood London. They demand that the government publish a secret document entitled 'Aftermath'. The Deputy PM denies any knowledge of the document, making it impossible to meet the terrorists' demands. The team suspect that the Deputy PM is hiding something. They discover that the Aftermath document does exist and it's political dynamite. It's a proposal to abandon any attempt to tackle global warming and instead build on economic and military strength so that Britain and America can control the remaining resources. Meanwhile, Adam enters the Thames Barrier in an attempt distract the terrorists so that Special Forces can storm in. But during the negotiation another post-traumatic stress attack seizes him. Ros agrees to take Adam's place in the proceedings, but the terrorists increase their demands. With the threat of a catastrophic tidal wave engulfing London, Harry gives orders to blow up and flood part of the Thames Barrier. Unfortunately it means possibly killing Ros and Adam. The blast goes off and Ros and Adam try to escape but find themselves trapped. Just as they run out of air, Adam manages to break through a vent in the roof and the exhausted pair burst through the surface of the Thames. |
Original Air Date—16 October 2007
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Original Air Date—16 October 2007
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Original Air Date—23 October 2007
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Original Air Date—30 October 2007
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Original Air Date—6 November 2007
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Original Air Date—13 November 2007
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Original Air Date—20 November 2007
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Original Air Date—27 November 2007
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Original Air Date—4 December 2007
After Yalta's attack on their satellite network, America is planning air-strikes on Iranian nuclear facilities. Harry's team are suspended from the Grid following the Ros Myers affair, and, when utterly impotent and isolated, an old adversary of Harry's appears out of the woodwork to inform them of a bomb he's planted in London. |
Original Air Date—18 December 2007
War with Iran finally averted, the team learn that a London school will be the target of hardliners resisting the new peace. Simultaneously they discover that their lost colleague, Zaf, was grotesquely tortured and killed by a group of mercenaries. When Jo is snatched by the group, Adam resists calls to stay focused on the school threat; the war has become personal and he must find Jo at all costs. |
Original Air Date—27 October 2008
MI-5 is having a particularly busy day. They have just exchanged spies with the Russians and welcome the return of Lucas North after 7 years of imprisonment. Harry Pierce's Russian counterpart, Arkady Katchimov hints however that they will soon have another agent in custody leading Connie James to try and call off an operation in Moscow that is literally minutes away from happening. Simultaneously, an Al Qaeda splinter group has kidnapped a soldier, Andy Sullivan, who has just returned from a tour of duty in Afghanistan. They release a video threatening to decapitate him if Remembrance Sunday ceremonies aren't canceled. MI-5 learn from the information gathered in Moscow that Al Qaeda is planning a much bigger attack in London. |
Original Air Date—27 October 2008
Convinced that his Russian counterpart in London, Arkady Katchimov, is behind the Al Qaeda bombing that killed Adam Carter, Harry Pearce launches an unauthorized investigation. Their task is to find a non-diplomatic source who would provide then with information on Katchimov's activities. Meanwhile, listeners capture an electronic burst leading them to believe there may be an unidentified Russian submarine in British waters. With Ros Myers now the head of the team, they focus on Alexander Beletsky, a Russian who has a relationship with Katchimov. They conclude that the Russians may be looking to tap undersea communications cables and launch a denial of service attack, thereby disabling the Internet throughout Britain. Lucas North is keen to get back to work but Harry insists that Lucas go through the entire re-integration process before he does so. A good decision given that it appears that North may in fact be working for the Russians. |
Original Air Date—28 October 2008
When a Pakistani agent informs them that there is an Al Qaeda cell planning an attack in London, MI-5 go into action. They already have an agent in place in the terrorist cell which is led by Nadif Abdelrashid. When what is supposed to be dry run turns out to be the real thing, MI-5 track four bombers as they walk through the city to what is their final destination. One by one, MI-5 try to take each of them down before the bombs explode but they aren't entirely successful. Lucas North meanwhile has a flashback to being tortured by his Russian jailers and recalls one of the interrogators asking about an operation known as Sugar Horse. For Harry Pearce alarms bells go off as the operation was one of the most guarded secrets and known only to a very few. He is convinced there is a Russian mole in the senior levels of the intelligence community and turns to Bernard Qualtrough, a retired spy catcher, to help him ferret out the turncoat. |
Original Air Date—3 November 2008
MI-5 is approached by Mohammed Khordad, the number 3 man in Al Qaeda, for a meeting. Under normal circumstances, they wouldn't even think of meeting the leader of a terrorist group but Harry Pearce is convinced that they should look at any opportunity to reduce the threat of attacks. Khordad is keeping his cards close to his chest and insists that they have to trust one another before they can deal. He tells Harry that a bomb will go off at 3 pm that afternoon unless the Home Secretary publicly absolves two suspected terrorists of any wrongdoing. If he can do that, he will then have more important information for him. As the MI-5 team try find the location of the bomb and Harry tries to convince the Home Secretary of the necessity of making a statement, they also have to deal with another problem: the CIA, which also has a interest in Khordad. |
Original Air Date—10 November 2008
MI-5 try to stop a ruthless City financier who is out to force the collapse of a major bank. Manipulating the market is Alexis Maynell's specialty. Ros Myers goes undercover to seek evidence that Meynell is spreading the rumors that the bank in question, Highland Life, is about to go under. The Minister is prepared to freeze Meynell's assets, but only if MI-5 can find concrete evidence that he is involved in insider trading and market manipulation. Ros' life is in danger however when her cover is blown. Connie James finds herself frozen out and under suspicion as Harry continues to investigate the leak around the Sugar Horse network. Harry realizes he may have made a very serious error. Jo Portman's flashbacks are beginning to affect her work. |
Original Air Date—17 November 2008
With the military situation in the Middle East rapidly deteriorating and a UN Special Envoy about to hold crisis talks in London, MI-5 come across a teenager selling a highly sophisticated - and classified - electronic disruptor. It turns out the young man saw it being used in the assassination of a photo-journalist and managed to steal it when the assassin was struck by a car. They identify the assassin as one Michael Sands, a former MI-6 agent who had disappeared on an operation two tears ago and who, they assume, has now gone native. As Lucas North babysits the young thief and his mother, the rogue MI-6 agents try to recover something other than the weapon itself. Harry meanwhile receives a coded message from a sleeper agent in Russia indicating that Sugar Horse has been compromised and that she is coming to England. What he doesn't realize is that someone is also trying to frame him. |
Original Air Date—24 November 2008
Sugar Horse is revealed to be a network of sleeper agents in Russia. They are there for use only in the direst of circumstances. Just as the West's relations are on the brink - there is much sabre-rattling when the US announces its plans to install its missile shield in former Eastern European countries - two Sugar Horse agents are apparently murdered. All of the evidence points to Harry Pearce who is arrested and is forced to undergo severe questioning. Lucas North travels to Moscow to see what he can learn. A member of the MI-5 team is revealed as a Russian mole and is now desperate to be extracted after killing another member of the team. |
Original Air Date—8 December 2008
With the Russian mole inside MI-5 now in custody, the team tries to decipher the information Lucas North obtained in Moscow. It is apparent that the Russian intelligence service had their own equivalent to the British Sugar Horse network and have sleeper agents across Britain and throughout the various security agencies. Information from the mole indicates that a thermonuclear device will be exploded in central London and offers to reveal the identity of all sleeper agents in the UK if they agree to provide protection and a relocation package. The Russians have issued instructions to kill Harry Pearce and all of the members of Section D so getting to the mole's information will be difficult. Harry decides to meet his Russian counterpart to ensure he knows that they will all die if they don't work together to stop the bombing. |
Original Air Date—4 November 2009
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Original Air Date—11 November 2009
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Original Air Date—18 November 2009
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Original Air Date—25 November 2009
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Original Air Date—2 December 2009
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Original Air Date—9 December 2009
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Original Air Date—16 December 2009
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Original Air Date—23 December 2009
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