Kit Harington Robert Catesby Actor, Executive Producer Peter Mullan Father Henry Garnet Actor Liv Tyler Anne Vaux Actor Mark Gatiss Lord Robert Cecil Actor Shaun Dooley Sir William Wade Actor Tom Cullen Guy Fawkes Actor Robert Emms Father John Gerard Actor Luke Neal Jack Wright Actor Edward Holcroft Thomas Wintour Actor Philip Hill-Pearson Digby Actor Richard Glover Slater Actor Derek Riddell King James I Actor David Bamber Lord Northumberland Actor Simon Kunz Lord Howard Actor Pedro Casablanc Constable of Castille Actor Ollie Madden Executive Producer Ronan Bennett Executive Producer, Writer Daniel West Executive Producer Laurie Borg Producer J Blakeson Director