Which actors who played Imperial officers, other than Mark Jones, were ever on Dr. Who? I don’t believe Tom Mannion was. Michael Culver wasn’t. Was Leslie Schofield, Julian Glover, Pip Miller, Alan Flyng, or Michael Sheard on Dr. Who?
He wasn’t on the show, but Peter Cushing played The Doctor in two movies (Dr. Who and the Daleks, Daleks’ Invasion of Earth 2150 AD) if that counts. Although they apparently took the title too literally and his name is actually “Dr. Who” in those movies.