The role of young Ducky in NCIS is played by actor Adam Campbell.

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Adam Campbell is a British actor and comedian.

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He was born on May 14, 1980, in Windsor, England.

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Campbell is known for his comedic and dramatic performances in both film and television.

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He has appeared in several popular TV shows such as How I Met Your Mother and Entourage.

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In NCIS, Adam Campbell portrays the younger version of Dr. Donald Ducky Mallard, played by David McCallum.

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The character of Ducky is a fan-favorite on the show, and the flashbacks to his younger self add depth to the character.

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Campbell's portrayal of young Ducky has been well-received by fans and critics alike.

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Adam Campbell's performance adds humor and heart to the show, while also allowing viewers to learn more about the character's backstory.

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Campbell's role as young Ducky has made him a memorable and beloved part of the NCIS cast.

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