David McCallum was an American actor best known for his portrayal of Illya Kuryakin in the 1960s hit spy drama The Man From U.N.C.L.E. and for his supporting role as pathologist Dr. Donald "Ducky" Mallard on NCIS.

McCallum's work on The Man From U.N.C.L.E. extended to a few feature adaptions of the franchise including One Spy Too Many, One of Our Spies Is Missing and The Karate Killers in attention to the TV movie The Return of the Man from U.N.C.L.E.: The Fifteen Years Later Affair. McCallum also guested as Kuryakin on the sitcom Please Don't Eat the Daisies.

McCallum's other works include BBC fantasy miniseries The Rose and the Ring, BBC-Universal Television's Colditz, NBC sci-fi drama The Invisible Man, ITV's Kidnapped and Sapphire & Steele, and NBC's The A-Team, in addition to many other TV series and feature films.

Though he was busy with screenacting, McCallum developed a second career as a voice actor on Toon Disney shows The Replacements and Ben 10, and in videogames such as Diablo III: Reaper of Souls.