Fans will finally be able to see Mark Harmon's grand return to the part of Leroy Jethro Gibbs in an ambitious crossover ...
Mark Harmon, who spent 18 seasons on "NCIS," is reprising his role as special agent Leroy Jethro Gibbs for a crossover event.
Harmon will return in the flesh for a special crossover event on Tuesday, Nov. 11. For one night only, “NCIS” and “NCIS: ...
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Mark Harmon to reprise his role as Gibbs in an appearance on NCIS: Origins
Origins to make a cameo appearance as Gibbs. Find out when to expect to see him make his second appearance on the series.
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