NCIS: Los Angeles fans should buckle up for the midseason premiere.

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The CBS drama will return from the winter hiatus with "Spiral," and the episode will feature a mixture death defying stunts and Densi fallout. As the team races to rescue Callen (Chris O'Donnell) after a group of terrorists overrun the skyscraper where he is working undercover, Deeks (Eric Christian Olsen) and Kensi (Daniela Ruah) will start to explore their new "all in" relationship philosophy.

"NCISLA Fans: I wrote "Spiral" knowing about Kensi & Deeks in "Humbug"...fun!" writer Dave Kalstein tweeted on Saturday. "But it features my best Callen & Sam scene ever. Monday on CBS!"

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While Densi's relationship continues to play out in the background, Sam (LL Cool J) will fight to save his partner. The former Navy SEAL never takes it particularly well when one of his teammates is in danger (and who would?), but Sam will undoubtedly up the ante when it's his longtime partner in the line of fire.

In fact, everyone will. Unfortunately for Deeks, this means hanging out a 16-story window as the team tries to foil the terrorists' plan to blow the skyscraper.

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

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