'NCIS' season 13 spoilers, plot rumors: The team tracks a notorious killer down with the help of Britain's MI6

Only two episodes are left before "NCIS" season 13 concludes its thirteenth episode, and the NCIS team will seek help from the MI6 in Britain for an important mission.

As noted in the official synopsis, the two units will work together with a common goal, and that is to take rogue MI6 Agent Jacob Scott down since he is responsible for the death of many people. In last week's episode, he shot FBI Agent Fornell in the chest twice, which makes the team even more eager to put a stop to his evil plans. Fans should definitely tune in because guest stars include "24" alum Sarah Clarke as Agent Tess Monroe from FBI and British actor Duane Henry who plays the role of Agent Clayton Reeves from MI6.

On another note, the last remaining episodes will also mark Tony DiNozzo's impending departure from the show. Actor Michael Weatherly previously confirmed that he will be leaving the show he was in for thirteen years, and his exit will definitely be bittersweet. Meanwhile, executive producer Gary Glassberg teased via TV Guide that the finale scheduled for May 17 will bring various surprises to fans. "There are going to be some surprises, really significant surprises," he said. "Expect more familiar faces and more names, and certainly as NCIS has proven to do in the past, expect the unexpected and expect some danger."

The summary for this week's episode titled "Dead Letter" reads:

"The NCIS team, alongside the FBI and MI6, continue an international manhunt for an escaped British spy who has left one colleague fighting for their life in ICU, on NCIS, Tuesday, May 10 (8:00-9:00 p.m., ET/PT), on the CBS Television Network. Sarah Clarke guest stars as FBI Special Agent Tess Monroe and Duane Henry guest stars as MI6 Officer Clayton Reeves."

Kepp tuning in for the last two episodes of "NCIS" season 13 which airs Tuesdays at 8 p.m. EST on CBS.