ITV DCI Banks Catch up on the ITV Hub Dark and harrowing crime drama, starring Stephen Tompkinson as Detective Chief Inspector Alan Banks. 2 episodes available to watch Share this programme: Share on Facebook Share on Twitter Share on Google+ Series 5 Latest 6. Undertow: Part 2 Wed Wednesday 5 Oct 9pm Banks must grapple with dark emotions if he is to discover who was behind the attack. 5. Undertow: Part 1 Wed Wednesday 28 Sept 9pm Banks breaks all the rules as he struggles to put personal feelings aside.