Watch the extended promo for the first crossover event between NCIS and NCIS: Origins, featuring Mark Harmon's return as ...

Abby was a key member of Gibbs’ team until Perrette exited NCIS at the end of Season 15. Officially, Abby left the Washington ...

While the characters who make up the large ensemble cast of NCIS may be beloved, that doesn't make them the best at their ...

Here are the shows that American viewers have been returning to time and again for comfort -- the 15 longest-running ...

NCIS: Origins brings back Vera Strickland — but her new casting raises familiar continuity questions for the franchise.

Executive producers from both shows preview the event, explain the challenges of crafting such a unique crossover, and share the themes it allowed them to explore.

"NCIS Origins" continues to have fun with the history of Gibbs, as in the latest episode explaining a joke that first turned up on the original show years ago.