Contains spoilers for upcoming episodes of "NCIS" and "NCIS: Origins"

Just in time for Sweeps month, Mark Harmon, after countless tours of duty on "NCIS," is coming back to the role that made him famous. The event in question is an "NCIS" and "NCIS: Origins" crossover set to air on November 11. The central focus will be a case that began in the 1990s during Gibbs' time at Camp Pendleton, and will be resolved in the modern era by the current "NCIS" crew. Harmon will only appear in the "Origins" half of the crossover, so don't expect many interactions with anyone from the "NCIS" side. On top of that, the shows will switch time slots for the crossover — "Origins" will air first, followed by "NCIS."

One tantalizing hint as to what Gibbs has been up to in his Alaskan home away from home was d

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