E1 • Episode 1

1. 59 min
2. TV-14
3. CC

An Al-Qaeda cell kidnaps a soldier and demands that Remembrance Sunday be cancelled.

E2 • Episode 2

1. 57 min
2. TV-14
3. CC

Harry vows revenge by taking down the head of Russia's intelligence service.

E3 • Episode 3

1. 57 min
2. TV-14
3. CC

Lucas reveals that the Russians interrogated him about MI5's most secret spy operation.

E4 • Episode 4

1. 57 min
2. TV-14
3. CC

Al-Qaeda's number three wants to negotiate, and Lucas's double-agent status is tested.

E5 • Episode 5

1. 57 min
2. TV-14
3. CC

Ros goes undercover in the City to flush out a dangerous international financier.

E6 • Episode 6

1. 58 min
2. TV-14
3. CC

A teenage boy stumbles upon a government conspiracy and is absorbed into the world of MI5.

E7 • Episode 7

1. 58 min
2. TV-14
3. CC

Harry is imprisoned and accused by MI5 of being the Russian mole.

E8 • Episode 8

1. 59 min
2. TV-14
3. CC

The team must turn to a traitor amongst them when the Russians launch a nuclear strike.