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David Keith McCallum Jr. (Born 19 September 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 voices Merlin in Batman: The Brave and the Bold.

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