Season seven of British spy thriller  quot MI-五 quot  opens with Adam Carter  Rupert Penry-Jones  valiantly battling to move a car bomb away from a densely packed memorial service  Meanwhile Harry secures the release of Lucas North  Richard Armitage , a MI-五 officer imprisoned in Russia for eight years  Its not long, however, before Ros begins to suspect Lucas loyalties  The rest of the season deals with a top secret Cold War-era operation named Sugarhorse