Mark Strong (born Marco Giuseppe Salussolia; 5 August 1963) is a British actor. He is best known for his film roles such as Prince Septimus in Stardust (2007), Archibald in RocknRolla (2008), Lord Henry Blackwood in Sherlock Holmes (2009), Frank D'Amico in Kick-Ass (2010), Jim Prideaux in Tinker Tailor Soldier Spy (2011), Sinestro in Green Lantern (2011), George in Zero Dark Thirty (2012), Major General Stewart Menzies in The Imitation Game (2014), Merlin in Kingsman: The Secret Service (2014) and Kingsman: The Golden Circle (2017), Dr. Thaddeus Sivana in Shazam! (2019), and John in Cruella (2021).