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David McCallum on mentors

David McCallum on advice to aspiring actors

David McCallum on how he would describe his NCIS character, "Dr. Donald Mallard" aka "Ducky'" and on "Ducky's" retirement and becoming NCIS historian

David McCallum on "Ducky's" heart attack at the end of season nine of NCIS and on his role as a mentor

David McCallum on a guest role in The Outer Limits episode "The Sixth Finger," the makeup transformation his role required, and his contributions to the script

David McCallum on working with Joanna Lumley on Sapphire and Steel

David McCallum on his early involvement in the amateur dramatics society and how he got interested in acting