Watch out, Densi fans, Jack is back.

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Kensi's (Daniela Ruah) ex-fiancé will return to NCIS: Los Angeles on Jan. 25, and a certain LAPD detective is not a happy camper.

Deeks (Eric Christian Olsen) and Kensi will attempted to take their relationship to the next level in "Come Back," but just as they're ready to shack up, Jack Simon (Matthew Del Negro) will come rolling back into their lives. To make matters worse, Hetty (Linda Hunt) will assign the workplace couple as Jack's protection detail. If that doesn't sound like trouble, you should see how well Deeks appears to handle the problem in the series' latest photos.

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"When Kensi and Deeks announce to the team they are moving in together, coincidentally, Hetty assigns them to protection detail for Jack (Matthew Del Negro), Kensi's ex-fiancé, who is in possession of a list containing important contacts in Afghanistan that people are willing to kill to get their hands on," CBS teased.

The shaggy-haired detective may joke around, but Deeks is, if anything, a consummate professional. While he will undoubtedly take the mission seriously, we all saw how jealous he got when Kensi enjoyed talking to DiNozzo (Michael Weatherly).

Will Jack's sudden appearance cause turbulence, particularly when it comes to Kensi having to make a commitment? Jack is, after all, a glaring reminder that she's already had a man walk out on her once. Hopefully old memories won't derail Densi's plans.

Find out more when NCIS: LA airs Mondays at 10 p.m. ET on CBS. Click the video below to see a preview for the series' next episode.