- 1 Episode 1
-
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.
Air Date: 2005-09-12
- 2 Episode 2
-
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.
Air Date: 2005-09-13
- 3 Episode 3
-
Far-right political party The British Way is threatening democracy so Adam and Fiona go undercover to infiltrate and destroy its campaign.
Air Date: 2005-09-19
- 4 Episode 4
-
Adam infiltrates a truck carrying illegal immigrants across Europe in order to stop a would-be terrorist.
Air Date: 2005-09-26
- 5 Episode 5
-
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.
Air Date: 2005-10-03
- 6 Episode 6
-
MI5 suspect a terrorist is planning an attack from his prison cell. Guest stars Jimi Mistry.
Air Date: 2005-10-10
- 7 Episode 7
-
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.
Air Date: 2005-10-17
- 8 Episode 8
-
An old British traitor is called on to infiltrate a Russian firm suspected of stealing secrets from GCHQ.
Air Date: 2005-10-24
- 9 Episode 9
-
Harry upsets the CIA by stopping an extradition to the USA.
Air Date: 2005-10-24
- 10 Episode 10
-
A former officer is convinced that MI5 killed Princess Diana and is determined to force the team to prove it.
Air Date: 2005-10-31