Covert CIA agent Martian is called back to London Station. An incident in Belarus puts Bosko and Henry on a collision course with Langley. Danny learns a lesson. Someone unexpectedly reappears in Martian's life. Series premiere.
Stars: Michael Fassbender, Jeffrey Wright, Jodie Turner-Smith
Director(s): Joe Wright
Writer(s): Jez Butterworth, John-Henry Butterworth, Eric Rochant