Mark Harmon's Gibbs Appears In NCIS' 1000th Episode (But Not How You Think) - Looper
Does Gibbs Appear In NCIS' 1000th Episode (Mark Harmon's Special Cameo Explained) - Screen Rant
Meet the new Gibbs: Mark Harmon's “NCIS: Origins” prequel series casts lead role - Yahoo Canada Shine On
NCIS’ Mark Harmon put his foot down when Gibbs was set for a completely different name - Express
The Real-Life Legal Issues Of NCIS Star Mark Harmon, Explained - MSN
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