![](https://image.tmdb.org/t/p/original/76JxxxBs8XUEaccemtqLxoB9CRj.jpg)
![](https://image.tmdb.org/t/p/w342/vU9AQcGh6g5hiiurp7RQGOic7k9.jpg)
Episode 4
Tensions in the circuit mount as Liz asserts her authority as the new leader. Gordon resents being bossed around by a woman. Vivien's mysterious behaviour arouses suspicion. And when disaster strikes, the team are forced to ask themselves: is there are traitor in their midst?
![](https://image.tmdb.org/t/p/w300/76JxxxBs8XUEaccemtqLxoB9CRj.jpg)
![](https://image.tmdb.org/t/p/w300/i5nzlphak3GbbCFoszeGQPH6VUP.jpg)
Other episodes for this season
![Episode 1](https://image.tmdb.org/t/p/w300/76JxxxBs8XUEaccemtqLxoB9CRj.jpg)
![Episode 2](https://image.tmdb.org/t/p/w300/76JxxxBs8XUEaccemtqLxoB9CRj.jpg)
![Episode 3](https://image.tmdb.org/t/p/w300/76JxxxBs8XUEaccemtqLxoB9CRj.jpg)
![Episode 4](https://image.tmdb.org/t/p/w300/76JxxxBs8XUEaccemtqLxoB9CRj.jpg)
![Episode 5](https://image.tmdb.org/t/p/w300/76JxxxBs8XUEaccemtqLxoB9CRj.jpg)
![Episode 6](https://image.tmdb.org/t/p/w300/76JxxxBs8XUEaccemtqLxoB9CRj.jpg)
![Episode 7](https://image.tmdb.org/t/p/w300/76JxxxBs8XUEaccemtqLxoB9CRj.jpg)