Intelligence

When Joseph accidentally deletes the department personnel files the whole team are forced to redo their aptitude tests. Afraid of having to take a polygraph, Jerry manoeuvres to take over and run the test procedure himself. But when Jerry suspects that Christine may be hiding feelings for him he reluctantly agrees to taking the polygraph providing Joseph can secretly twist the results.

When GCHQ is hacked, Jerry suggests the person behind the cyber attack should join the team. But when Joseph becomes jealous of Jerrys cool new friend he looks to change his image and win back Jerrys affection. Meanwhile, shy cryptanalyst Mary gears up to seeing her ex-boyfriend for first time in 40 years whos been asked to deliver a seminar at GCHQ.

When Jerry finds out his best friend and FBI agent Clint has been sleeping with his wife he accidentally shoots him. But when Clint shows up at GCHQ with an extradition order for Jerry, the truth about Jerrys NSA past comes out. Hoping it will grant Jerry British citizenship, Joseph and the team stage a wedding to protect Jerry and prevent him from leaving the UK.

Jerry is hailed as the hero as disaster is averted at the nuclear power plant but threats still loom large. Meanwhile, the CySec mole is exposed.

A rival GCHQ team find important information about the cyber weapon Eternal Blue. But when they refuse to share it, Jerry must think of a solution.

After saving the day—and his own skin—Jerry is facing a bright future. Will he stay at GCHQ or go back to the US?