The core trio of Adrian Dunbar (Supt. Ted Hastings), Vicky McClure (DS Kate Fleming), and Martin Compston (DS Steve Arnott) are all reprising their roles as officers of AC-12.
Other familiar faces returning include Maya Sondhi as PC Maneet Bindra, Polly Walker as Gill Biggeloe, Aiysha Hart as DS Sam Railston, Tony Pitts as Det. Ch. Supt. Les Hargreaves, and Andrew Irvine as Robin Hastings.