Check out the new Gunpowder trailer featuring Kit Harington Today we have a new Gunpowder trailer from HBO. The three-part thriller based on the real-life 17th century events that lead to Guy Fawkes Day will debut on Monday, December 18. You can watch the new Gunpowder trailer in the player below. In Gunpowder, Harington will star as Robert Catesby (the 30 year-old Warwickshire gentleman who was the driving force behind the gunpowder plot), alongside Peter Mullan as Father Garnet, Mark Gatiss as the Spymaster Robert Cecil, and Liv Tyler as Ann Vaux. They are joined by Edward Holcroft (Kingsman) as Thomas Wintour, Catesby’s friend and co-conspirator, with Shaun Dooley (Broadchurch) as Sir William Wade, Lieutenant of The Tower and Cecil’s right-hand man.