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'NCIS' 1000th Episode: Go Behind the Scenes as Cast Teases Easter Eggs, Crossovers and More (Exclusive)

The show will air its 1000th episode in the franchise on Monday night.

In the 21 years since the pilot aired in September 2003, the show has amassed an unmatched fanbase, created 4.2 trillion minutes of television and spawned several wildly successful spinoffs based in Los Angeles, Hawaii, Sydney and New Orleans. While the mothership is ostensibly the most triumphant of the bunch -- racking up nearly half of the 1,000 episodes franchise-wide -- fans have become equally attached to the various series set around the world and the lovable characters each show brings. The 46-year-old actor has played Special Agent Timothy McGee since the show's inception and told ET that while the 1000th episode will be fun to watch for any and all fans, the OG lovers are going to be the most pleased by what the cast and crew bring to the table.

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