Iain De Caestecker ( ; born 29 December 1987) is a Scottish actor. He is best known for portraying Leopold Fitz/The Doctor in the television series Agents of S.H.I.E.L.D. (2013-2020). He is also known for his roles in Coronation Street (2001-2003) as Adam Barlow and the films Shell (2012), In Fear (2013), Not Another Happy Ending