Seasons & episodes
S3 · E9Frequently Asked Questions 2004-12-06 · 52 min
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?
S3 · E10The Suffering of Strangers 2004-12-13 · 52 min
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.
S4 · E1The Special (1) 2005-09-12
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.
S4 · E2The Special (2) 2005-09-13
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.
S4 · E3Divided They Fall 2005-09-22
Far-right political party The British Way is threatening democracy so Adam and Fiona go undercover to infiltrate and destroy its campaign.
S4 · E4Road Trip 2005-09-29
Adam infiltrates a truck carrying illegal immigrants across Europe in order to stop a would-be terrorist.
S4 · E5The Book 2005-10-06
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.
S4 · E6The Innocent 2005-10-13
MI5 suspect a terrorist is planning an attack from his prison cell. Guest stars Jimi Mistry.
S4 · E7Syria 2005-10-20
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.
S4 · E8The Russian 2005-10-27
An old British traitor is called in to infiltrate a Russian firm suspected of stealing secrets from GCHQ.
S4 · E9The Sting 2005-11-03
Harry upsets the CIA by stopping an extradition to the USA.
S4 · E10Diana 2005-11-10
A former officer is convinced that MI5 killed Princess Diana and is determined to force the team to prove it.
S5 · E1Gas and Oil (Part 1) 2006-09-17 · 52 min
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.
S5 · E2Gas and Oil (Part 2) 2006-09-17 · 52 min
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.
S5 · E3The Cell 2006-09-18 · 52 min
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.
S5 · E4World Trade 2006-09-25 · 52 min
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.
S5 · E5The Message 2006-10-02 · 52 min
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.
S5 · E6Hostage Takers (Part 1) 2006-10-09 · 52 min
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.
S5 · E7Hostage Takers (Part 2) 2006-10-16 · 52 min
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.
S5 · E8Agenda 2006-10-23 · 52 min
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.
S5 · E9The Criminal 2006-10-30 · 52 min
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.
S5 · E10Aftermath 2006-11-13 · 52 min
An environmental terrorist group is threatening to flood London if the government does not make a secret document public.
S6 · E1The Virus: Part 1 2007-10-16
Zaf and Adam participate in a mission in Tehran that goes wrong. As the investigation advances, the team realizes they've been lied to as to the goals of their mission.
S6 · E2The Virus: Part 2 2007-10-16
The country faces a plague outbreak. In a race against time, the officers from Section D have to track down and quarantine everyone who might be infected, while preventing a panic.