For twenty seasons NCIS has captured viewers with its fascinating plots and adored characters. The outstanding David McCallum plays Dr. Donald “Ducky” Mallard, the show’s central character. With a career spanning decades, McCallum’s portrayal of Ducky cemented his position in television history.

In “Meat Puzzle,” Ducky’s testimony against a k1ller adds layers to the storyline, showcasing the strength of his friendship with Gibbs and the team.

In “Shiva,” Ducky’s verbal sparring with Mossad Deputy Director Elon Bodnar demonstrates his quick wit and unflinching confidence.

Ducky’s role as a mediator between Kate and Tony in “Red Cell” demonstrates his insight into interpersonal dynamics within the team.

In “Whiskey Tango Foxtrot,” Ducky’s fast thinking and decisive response during an intruder’s att4ck demonstrate his bravery and determination.

The iconic head slap Ducky delivers to Tony in “Frame Up” highlights the camaraderie and humor that permeates NCIS.

Ducky’s transition into “Charles Harrow” in “Requiem” demonstrates his adaptability and effectiveness as an undercover operative.

In a touching moment from Season 18, Ducky expresses his concern for Gibbs’s well-being, demonstrating the depth of their friendship and his caring nature.

Lastly, Ducky’s encounter with a psychopathic k1ller in “Psych Out” serves as a cautionary tale about the dangers of online relationships.