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Tense drama series about the different challenges faced by the British Security Service as they work against the clock to safeguard the nation.

Cast: Ruth Evershed - Nicola Walker; Dimitri Levendis - Max Brown; Tariq Masood - Shazad Latif; Jo Portman - Miranda Raison; Lucas North - Richard Armitage; Ben Kaplan - Alex Lanipekun; Malcolm Wynn-Jones - Hugh Simon; Tessa Phillips - Jenny Agutter; Ros Myers - Hermione Norris; Helen Flynn - Lisa Faulkner; Adam Carter - Rupert Penry-Jones; Sam Buxton - Shauna MacDonald; Colin Wells - Rory MacGregor; Zoe Reynolds - Keeley Hawes; Zafar Younis - Raza Jaffrey; Calum Reed - Geoffrey Streatfield; Jed Kelley - Graeme Mearns; Erin Watts - Lara Pulver; Connie James - Gemma Jones; Fiona Carter - Olga Sosnovska; Tom Quinn - Matthew Macfadyen; Danny Hunter - David Oyelowo; Beth Bailley - Sophia Myles; Harry Pearce - Peter Firth;

Network: BBC One (United Kingdom)
Premiered: 13.May.2002
Status: Ended