Along with Gibbs getting the spotlight last episode, a global hunt is set to happen in "NCIS" season 13 episode 21.

"NCIS" season 13 episode 21 is Michael Weatherly's final episode, entitled "Family First." According to CBS' official website, the episode is set to see the NCIS, FBI, and MI6 push through their international manhunt for an escaped British spy, who is tracking down present and previous agents. Whether the organizations manage to halt their target is yet to be revealed.

In a promo trailer for "NCIS" season 13 episode 20, it is seen that the working forces of the FBI and NCIS, which is thrilling because they are at odds, according to Design and Trend. As per the publication, the episode's theme is comparable to "your case or mine," as both organizations are vital and powerful and they both do their part in finding the targets.

Fans saw Gibbs and Senior FBI Agent T.C. Fornell work hand in hand in "NCIS" season 13 episode 20, which is entitled "Return to Sender." According to CBS, Gibbs and Fornell went after two British prisoners, who escaped and arrived stateside through a shipping container. The episode also saw McGee, who was busy looking for an apartment. The character was also eager to learn how DiNozzo purchased his extravagant nest.

The storyline is also set to introduce new characters from the FBI and MI6, which will reportedly take over DiNozzo. As per reports, "24" star Sarah Clarke will play FBI Agent Tess Monroe while "The Dark Knight Rises" actor Duane Henry is set to play former MI6 officer Clayton Reeves in the episode. Details on how they will impact the overall story plot is yet to be revealed.

"NCIS" season 13 episode 21, "Return to Sender," is set to air on Tuesday on CBS. Watch the promo clip here.