Written by Ronan Bennet (Top Boy) and directed by J Blakeson (The Disappearance of Alice Creed) Gunpowder, a three-part thriller based on the 17th century events that led to Guy Fawkes Day, stars Kit Harington (Game of Thrones) as Robert Catesby, who was the driving force behind the Gunpowder Plot in 1605 London.