When Jerry - an American NSA agent - joins a team at GCHQ tackling cybercrime, junior analyst Joseph is particularly excited. But Director of Cyber Security Christine is less keen with the shakeup and wants to know the real reason Jerry is over here.

Joseph accidentally deletes the department personnel files, forcing the team to redo their aptitude tests. Afraid of having to take a polygraph, Jerry attempts to run the test procedure himself - providing Joseph can secretly twist the results.

A bored Jerry goes against Christine's orders and convinces the team to go after a hacker his own way. Comedy with David Schwimmer and Nick Mohammed.

GCHQ falls victim to a cyber attack, and Jerry thinks it would be a great idea if the hacker joins the team. Shy Mary prepares to see her ex.

Jerry makes a confession that devastates Joseph and leads to him questioning their entire friendship. Having failed her appraisal, Christine tries a new approach.

A shock turn of events outs Jerry's past. As his job at GCHQ comes under threat, Joseph hatches an elaborate plan to keep him in the UK.