Sean appeared in the series for a total of six episodes. Why? The plane is carrying the bodies of six dead Marines from Afganistan. Sean Harmon played Agent Gibbs in 6 ‘NCIS’ episodes from 2008 to 2012 Sean Harmon first appeared in NCIS in the 2008 episode titled “Heartland,” as IMDb notes.

', 'Forever', 'The Voice', and 'Dancing With the Stars' Adjusted Up; 'Chicago Fire' & 'Person of Interest' Adjusted Down", "Tuesday Final Ratings: 'Selfie', 'Manhattan Love Story', 'The Voice', 'Marvel's Agents of S.H.I.E.L.D. Based out of Washington, D.C., the team includes special agents Caitlin Todd (Sasha Alexander), Anthony DiNozzo (Michael Weatherly), Timothy McGee (Sean Murray), Ziva David (Cote de Pablo), Eleanor Bishop (Emily Wickersham), Alexandra Quinn (Jennifer Esposito), and Nicholas Torres (Wilmer Valderrama), forensic specialists Abby Sciuto (Pauley Perrette) and Kasie Hines (Diona Reasonover), medical examiners Jimmy Palmer (Brian Dietzen) and Donald "Ducky" Mallard (David McCallum), medical examiners assistant Gerald Jackson (Pancho Demmings) and SIS attaché Clayton Reeves (Duane Henry). Be sure to get some more news when it comes to NCIS.

In Which 'NCIS' Episodes Did Mark Harmon's Son, Sean Harmon, Play Young Gibbs? Your email address will not be published.

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And, though no one can imagine anyone else playing Gibbs, it’s important to remember that Mark Harmons’ son, Sean Harmon, portrayed a younger version of Gibbs in a handful of episodes. The plane is carrying the bodies of six dead Marines from Afganistan.