Mark Harmon is set to return to NCIS for a special episode with a story that spans decades. In light of his retirement from the procedural, Leroy Jethro Gibbs also walked away from MCRT and decided to settle in Alaska. Since then, the beloved character hasn't made any appearance in the flagship — even with several special outings, including Ducky's send-off and NCIS ' 1000th episode .

Thus far, Harmon has only appeared in the NCIS: Origins pilot, bookending the first hour of the prequel that Harmon is also co-producing. Despite his cameo, not much is revealed about what he has been up to in Alaska. Instead, it only established that he has been reminiscing on the earliest days of his career in NCIS.

That's about to change, however, as CBS now confirms that Harmon will appear

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