Iain De Caestecker Iain De Caestecker 12/29/87 Actor Biography There is no information about «Iain De Caestecker» yet. Roles Leo Fitz (Actor) Marvel's Agents of S.H.I.E.L.D. Agent Leo Fitz (Actor) Marvel's Agents of S.H.I.E.L.D.: Slingshot Duncan Knock (Actor) Roadkill Younger Douglas (Actor) Us James Herriot (Actor) Young James Herriot Gabe (Actor) The Control Room Arthur Pendragon (Actor) The Winter King Paul Roberts (Actor) The Fades Young Percy (Actor) The Secret of Crickley Hall Gallery