Synopsis
A brutal ambush on a police convoy leaves three officers dead and a protected witness fighting for his life. AC-12 turn their spotlight on Lindsay Denton, the officer who led the convoy but escaped unscathed.
Similar broadcast resources

S1E4: An Unearthly Child: The Firemaker | Doctor Who (1963-1996)
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S1E3: An Unearthly Child: The Forest of Fear | Doctor Who (1963-1996)
The Doctor and crew leave the TARDIS to explore their new surroundings, but are soon captured, thrown in a cave and threatened with death. They only have the secret of fire to bargain with.