David McCallum

David Keith McCallum, Jr. (Born September 19, 1933) is a Scottish actor and musician who is best known for playing Illya Kuryakin in The Man from U.N.C.L.E., Steel in Sapphire & Steel and Dr. Donald "Ducky" Mallard in ''NCIS. ''He played the voice of Professor Paradox in Ben 10: Alien Force, Ultimate Alien and Omniverse.