WARNING: This article contains spoilers for NCIS: Los Angeles season 10 episode 23. Read at your own risk.

NCIS: Los Angeles season 10 episode 23 is the penultimate of the season, and it is arriving next week featuring the return of JAG star David James Elliot as Harmon "Harm" Rabb Jr. Here's what to expect in the upcoming episode with the title "The Guardian."

According to the synopsis of NCIS: Los Angeles season 10 episode 23, the team uncovered ISIS sympathizers targeting military locations, so Sam and Callen traveled to the USS Allegiance in the Persian Gulf to work with Navy Captain Harmon "Harm" Rabb, Jr.

Many are familiar with Elliot's character, as he was first introduced in JAG - the show that becomes the source of the whole NCIS franchise. Another JAG star joining the May 19 finale is Catherine Bell's Sarah 'Mac' MacKenzie, and it is worth mentioning that NCIS: Los Angeles showrunner R. Scott Gemmill also worked on JAG.

Going back to NCIS: Los Angeles season 10 episode 23, Gemmill said he wanted to make sure Harm wasn't the same guy like he was on JAG. Viewers will reportedly see a different side of the character, and seeing him in a different series will surely bring different stuff as well. That's also the same thing for Bell's character in the season finale; fans will be seeing a different side of her.

Now, since the characters of Elliot and Bell are becoming more significant in the series, many are now speculating CBS is subtly setting up a new version of JAG. A report from TVLine claimed the network is currently "testing the waters on."

While CBS declined to answer about this matter, the report said the network is using NCIS: Los Angeles in testing a possible idea for the JAG stars. Furthermore, Gemmill said in a recent interview that there's a possibility of JAG revival, though the decision is still up to the network.

Meanwhile, the return of Harm in NCIS: Los Angeles season 10 episode 23 would probably lead to a cliffhanger, especially since the next episode after that would be the final for this season. Many are excited to see what he could do, as well as MacKenzie, in the NCIS world, and if they would be part of the future seasons.

NCIS: Los Angeles season 10 episode 23 will air on Sunday, May 12, on the CBS.