Episode 7

After his violent encounter with Yorkie, Ash returns to work at a low ebb: Lorna has thrown him out, and now that his cover is blown with Docker, Cartwright has benched him. But Ash is convinced that their 'Mr Big' is planning a big shipment of drugs. Cartwright is sceptical, so Ash secretly begins to investigate on his own.

Meanwhile, with round-the-clock surveillance on Docker yielding nothing, the Unit are desperate for any possible lead. The discovery of a new player in town - violent ex-con Casby, keen to muscle in on Roach's organisation - could lead them to finally putting a face to the figure at the top of their board.

The team know that everything is at stake: if they fail to finally unmask their 'Mr Big', the Unit will be finished.