Once the nation's favourite, by its third year Doctor Who was in trouble. With changes afoot in the production office and increasing problems with its lead actor, the programme was heading for the Last Chance Saloon.

One dark, wet November night in 1605, a group of men planned the most audacious act of terrorism England had ever known. The Gunpowder Plot failed, but why? Based on historical evidence we've made up, behold the controversial truth of what really happened.

Schoolteachers Barbara Wright and Ian Chesterton were the first people from Earth to travel with the Doctor. This documentary tells their story. With actor William Russell, director Richard Martin, studio vision mixer Clive Doig and writer Simon Guerrier.