Alfie Evan Allen(born September 12, 1986) is an English actor, best knownfor his role as Theon Greyjoyon theHBOfantasy seriesGame of Thrones(2011–2019), for which he received a nomination for thePrimetime Emmy Award for Outstanding Supporting Actor in a Drama Seriesin 2019. In film, he is best known for his starring roles inJohn Wick(2014),The Predator(2018), andJojo Rabbit(2019).His older sister is singerLily Allen. Allen's first professional appearance was in a one-offChannel 4comedy,You Are Herein 1998. The same year, Allen and his sister Lily appeared in the 1998 film,Elizabeth, which was produced by their mother.His early work included small roles inAgent Cody Banks 2: Destination London, Atonementand BBC1's historical hospital drama,Casualty 1907. In 2008, he took over Daniel Radcliffe's role in the stage play, Equus. He has continued to work in films, appearing inSoulboy,The Kid,FreestyleandPowderin 2010.In 2012, he starred in the British thriller,Confine..