A shocking start to Season 18 of 'NCIS' launches the team into a year like no other. The action begins with a bang and spools up from there. Answering the mystery of where Gibbs (Mark Harmon) disappeared to last season, we follow him through his secret mission. But global threats never stop as the rest of the team brave new dangers and higher risks. In the landmark 400th episode, we delve into Gibbs' first day at NCIS with his future colleague, Ducky…and the rest is history.
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