Fionn Whitehead (/fɪn/ FINN; born 18 July 1997) is an English actor. He portrayed the lead role in the 2017 film Dunkirk and the 2018 film Black Mirror: Bandersnatch. His first acting credit was in the 2016 ITV miniseries Him. Description above from the Wikipedia article Fionn Whitehead, licensed under CC-BY-SA, full list of contributors on Wikipedia.