Mark Harmon, who spent 18 seasons on "NCIS," is reprising his role as special agent Leroy Jethro Gibbs for a crossover event.
Gibbs (Austin Stowell) and Ducky Mallard (Adam Campbell) already have a personal history together, which is why Ducky's called in as a liaison between Gibbs' people at Camp Pendleton and the D.C. NCIS ...
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