About the Character: The younger version of Tom Hollander’s character Douglas is shown in flashbacks of his early years with his wife Connie.

Where You’ve Seen Him Before: De Caestecker previously starred as Leo Fitz in the television series Agents of S.H.I.E.L.D., and also appeared in the long-running series Coronation Street. MASTERPIECE fans may also remember De Caestecker from his role in Roadkill, alongside Hugh Laurie, Helen McCrory, and Us co-star Saskia Reeves.

Fun Fact: De Caestecker once appeared in a music video — singer-songwriter Gabrielle Aplin’s video for her song “Please Don’t Say You Love Me”.