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David McCallum as Ducky Mallard in NCIS.

David McCallum (born September 19, 1933) is a Scottish actor and musician who is best known for playing Illya Kuryakin in The Man from UNCLE, Steel in Sapphire and Steel, Dr. Donald "Ducky" Mallard in NCIS and for voicing Professor Paradox in the Ben 10 franchise.

He voiced Car in the Disney Channel animated series The Replacements.  He also played Paul Curtis in The Watcher in the Woods.