NCIS: Los Angeles season 10 is staging a big JAG reunion! Catherine Bell and David James Elliott, who worked together for 10 seasons on JAG, are reprising their roles as Lt. Col. "Mac" Sarah MacKenzie and Captain Harmon "Harm" Rabb, Jr in the season finale of NCIS: Los Angeles.

Set for airing on Sunday, May 19, the NCIS: Los Angeles team will need the help of Mac to reach out to a Russian diplomat as they follow a trail of ISIS sympathizers. It will be Hetty (played by Linda Hunt) who will call on her old friend, Mac, for the assistance. 

Harm, on the other hand, will be popping up on NCIS: Los Angeles season 10 a week ahead than his former co-star. He's now working as an XO in the USS Intrepid and has been following up on an ISIS case with Callen (played by Chris O'Donnell) and Hanna (played by LL Cool J), as per The Hollywood Reporter.

According to Deadline, if the episode featuring Mac and Harm would succeed in the ratings, there could potentially be a rebooted spinoff in the works. It bears noting that the NCIS franchise is, in fact, a spinoff of JAG.

Avid viewers of the franchise may recall that the first NCIS with Mark Harmon, Michael Weatherly, Pauley Perrette, and David McCallum was spun from a JAG backdoor pilot in 2003. Since the cancellation of JAG, however, both Bell and Elliot have not reprised their roles until NCIS: Los Angeles season 10. 

Meanwhile, CBS has not yet confirmed these reboot and spinoff talks. Rumors are rife that NCIS: Los Angeles could be on the way out after season 10. Fans had speculated just as much in the most recently aired episode when the characters of Renée Felice Smith (as Nell) and Barrett Foa (as Eric) went through some life-changing experiences.

Nell learned that her mother needed a major treatment in San Francisco while Eric has a job offer in the Golden City. According to TV Insider, it is as if the show has been setting up these characters exits on NCIS: Los Angeles. However, is it also possible that CBS is hatching their spinoff?  

CBS has not yet renewed NCIS: Los Angeles for season 11. Though its numbers are slightly down compared to last season, it's still doing pretty well with averagely 7.5 million live viewers per week, so a renewal is still possible.