The NCIS: Los Angeles team is heading into a fishy situation when they have to team up with an undercover DEA agent.

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After a deadly explosion rocks a fishing wharf, the NCIS crew will investigate the incident as a possible terrorist attack. However, Callen (Chris O'Donnell) and Co. aren't the only government agents on the case and an undercover DEA agent will soon wander into their midst.

As the trio works with their Drug Enforcement counterpart to determine if the unfortunate explosion was related to a messy drug deal or something more sinister, Deeks (Eric Christian Olsen) will face even more trouble on an emotional level.

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"515 spoiler: Deeks works a case with someone who challenges his feelings. Will he stay true. #staytuned #NCISLA," teased executive producer John Peter Kousakis.

Although Kousakis doesn't explicitly state what feelings the LAPD detective will be struggling with, Kensi (Daniela Ruah) is still stationed overseas and Nina/Talia (Mercedes Masohn) will be coming onto the scene as the DEA agent. Could Deeks romantic interests be tested while his partner is away?

While fans wait to find out what struggle Deeks will face, a new preview for "Fish Out of Water" Olsen's character is just as amusing as ever - and Callen and Sam will continue to groan at his antics (see video here).

NCIS: Los Angeles airs Tuesdays at 9 p.m. ET on CBS. Click here to see episode stills from "Fish Out of Water."

Tags
NCIS: LA, NCIS: Los Angeles, CBS, Television