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David McCallum as Dr. Donald Mallard NCIS David McCallum and Brian Dietzen NCIS David McCallum and Sean Murray NCIS David McCallum, Mark Harmon, Sarah Jane Morris and Brian Dietzen NCIS Mark Harmon, David McCallum, Cote de Pablo and Sean Murray NCIS David McCallum NCIS David McCallum NCIS David McCallum NCIS David McCallum as Dr. Donald Mallard NCIS
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