Kieran Wallace takes Smithy to meet Darren Cutler, the leader of the gun running gang, at a Millwall football match - and the undercover sergeant plays his role so well his watching colleagues think he may be a turncoat. Beth and Will trace a consignment of unstable fireworks destined for the same football stadium. When a box of fireworks goes off in front of their police car, they discover that young boy Jason Patterson is responsible. However, when they learn that the boy's step father is about to detonate the remainder of the consignment, they race against time to save supporters.
- Alex Walkinshaw as Sgt Dale Smith
- Roberta Taylor as Insp Gina Gold
- Christopher Fox as DS Max Carter
- Sam Callis as Sgt Callum Stone
- Andrew Lancel as DI Neil Manson
- Lucy Speed as DC Stevie Moss
- Rhea Bailey as PC Mel Ryder
- Gary Lucy as PC Will Fletcher
- Louisa Lytton as PC Beth Green
- Daniel Flynn as Supt John Heaton
- Micah Balfour as PC Benjamin Gayle
- John Bowler as PC Roger Valentine
- Graham Cole as PC Tony Stamp
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