Kingsman is an American comic book series that debuted in 2012 with the first graphic novel, subtitled The Secret Service. Three sequels, subtitled Mum's the Word, The Big Exit, and The Red Diamond, followed in 2016, 2017, and 2018 respectively. The series, following the recruitment of Gary London, into a secret spy organization by his uncle, Jack London, and his subsequent world-saving adventures as Agent Galahad, was initially published simply as The Secret Service before being rebranded following the release of the first film adaptation of the series. The series was created by Mark Millar and Dave Gibbons from a concept by Millar and an uncredited Matthew Vaughn, and set in Millar's shared universe, the Millarworld, with the celebrity kidnappings taking place in the first volume being referred to in Kick Ass: The Dave Lizewski Years Book Four, leading into the 2023 crossover event Big Game.