David Keith McCallum, Jr. (born 19 September 1933 ... series The Man from U.N.C.L.E., as interdimensional operative Steel in Sapphire & Steel, and Dr. Donald "Ducky" Mallard in the series NCIS.

David McCallum, the British actor who became a star ... The actor also starred in Colditz, The Invisible Man and Sapphire & Steel. "David was a gifted actor and author, and beloved by many around ...