Callen will go undercover in the next episode of "NCIS: Los Angeles" season 8.

In episode 8 of the hit CBS procedural drama, Calen will pretend to be a patient in a mental hospital as he tries to accomplish an interesting mission.

Titled "Crazy Train," the episode will follow Calen as he blends in as one of the patients to find a missing NSA agent. The agent disappeared without a trace while tracking down an ISIS cell who was previously attempting to cross the Mexican border.

The recent episodes of the series showed that Kensi was already up from her coma, and this was celebrated by the entire team. However, it looks like her recovery from her injuries will not be that easy for her. It can be recalled that as soon as she woke up, she squeezed Deek's hand with her right hand but could not move her left hand.

In the upcoming episode, Kensi will have a tough time dealing with the possibility that she could never walk again. If that happens, she may never be able to join her team anymore. However, fans can expect that despite her condition, Deeks will never ever leave her side no matter what.

In a recent interview, executive producer Scott Gemmill hinted that the two may actually even have kids in the future. Gemmill told TV Guide that the ordeal may be affecting their relationship, but it can also serve to strengthen the foundation of their love for each other.

"NCIS: Los Angeles" season 8 airs every Sunday night on CBS.