The three currently airing NCISes are doing something they have never done before. They are coming together as one for a crossover event in January.
According to Entertainment Weekly, we can expect to see NCIS’ Gary Cole, Wilmer Valderrama, and Brian Dietzen; NCIS: Los Angeles’ Chris O’Donnell and LL Cool J; and NCIS: Hawai’i’s Vanessa Lachey, Yasmine Al-Bustami, and Noah Mills along with a few surprised.
Since the special is still being planned, we don’t know if it will air one night or start on Sunday with LA and wrap on Monday with the mothership and Hawai’i. Personally, I think they should do it as a one-night spectacular. It has worked well for Dick Wolf’s shows.