'NCIS: LA': The Best 'JAG' Moments in Season 10 (PHOTOS)

Meredith Jacobs

[Warning: The below and above contain MAJOR spoilers for the Season 10 finale of NCIS: Los Angeles, "False Flag."]

Oh, those familiar notes.

In addition to bringing back David James Elliott as Harmon "Harm" Rabb in the penultimate episode of Season 10 and Catherine Bell as Sarah "Mac" Mackenzie in the finale, NCIS: Los Angeles brings back the familiar sounds of the JAG theme when each first appeared on-screen.

First, Sam (LL Cool J) and Callen (Chris O'Donnell) travel to the USS Allegiance to investigate a threat and meet with the ship's XO, Harm. Then in the finale, Hetty (Linda Hunt) recruits her old friend, Mac, to liaise with a Russian diplomat.

Though there isn't much time to spend on their personal relationship, viewers do receive an update on Harm and Mac's romantic status — and it isn't a positive one.

10 'JAG' Stars Who Appeared on 'NCIS,' 'NCIS: LA' & 'NCIS: New Orleans' (PHOTOS)

10 'JAG' Stars Who Appeared on 'NCIS,' 'NCIS: LA' & 'NCIS: New Orleans' (PHOTOS)

David James Elliott and Catherine Bell aren't the first alums to reprise their roles.

Click through the gallery above to see Harm and Mac's best moments from the last two episodes of Season 10.

NCIS: Los Angeles, Season 11, Fall 2019, CBS