Dave Greene was a security guard for a yard in the Forest of Dean, who sighted a Gorgonopsid attacking a truck in the yard.

While investigating the sighting, Nick Cutter and his team visited and questioned Dave on what he saw, and Dave showed them the destroyed truck in the yard and explained what he saw of the Gorgonopsid. Connor Temple believed Dave, while Cutter and Stephen Hart were doubtful. (Episode 1.1)