All three series of the British television espionage drama, following the dangerous missions and conflicting rivalries of a group of MI5 agents as they fight the threat of terrorism, foreign governments hostile to Britian, and organised crime. Starring Matthew MacFadyen, Keeley Hawes and David Oyelowo. Episodes from series one are: 'Thou Shalt Not Kill'; 'Looking After Our Own'; 'One Last Dance'; 'Traitor's Gate'; 'The Rose Bed Memoirs' and 'The Lesser of Two Evils'. Episodes from series two are: 'Legitimate Targets'; 'The Nest of Angels'; 'Spiders'; 'Blood and Money'; 'I Spy Apocalypse'; 'Without Incident'; 'Cleanskin'; 'Strike Force'; 'The Seventh Division' and 'Smoke and Mirrors'. Episodes from series three are: 'Project Friendly Fire'; 'The Sleeper'; 'Who Guards the Guards?'; 'A Prayer For My Daughter'; 'Love and Death'; 'Persephone'; 'Outsiders'; 'Celebrity'; 'Frequently Asked Questions' and 'The Suffering of Strangers'.