Darren Morfitt has played two different characters over the course of the series:
- Episode 20.4 Discovery: Part 2 (2017) - DCI Andy Steemson
- Episode 20.3 Discovery: Part 1 (2017) - DCI Andy Steemson
- Episode 14.6 First Casualty: Part 2 (2011) - Sgt Jason McDermott
- Episode 14.5 First Casualty: Part 1 (2011) - Sgt. Jason McDermott