NCIS: Los Angeles' is cooking up a mid-season episode that will blow fans away.

Eric Christian Olsen & Daniela Ruah Dish On Densi Chemistry, What's Next For Deeks & Kensi On 'NCIS: LA'?

Penned by Dave Kalstein, the shocking episode will film as ep. 609, although it probably will air as the 11th or 12th installment of season 6. Kalstein brought viewers such Densi-centric storylines as "The Frozen Lake" and there is a good possibility that the writer will take on the Deeks (Eric Christian Olsen)/Kensi (Daniela Ruah) plot again.

Whatever the case may be, executive producer John Peter Kousakis promises that it will shake up the NCIS: LA world.

Mystery Of The Box Continues On 'NCIS: LA', Will David Kalstein Episode Solve Densi Mystery?

"Scout continues for Ep.609. [Director Larry Teng and Dave Kalstein] are charging forward to bring you thrills and suspense," Kousakis tweeted on Monday.

In the meantime, the Office of Special Projects has to clear Sam's (LL Cool J) name when he is arrested for murder. While Hetty's (Linda Hunt) team attempts to uncover the truth in the Chris O'Donnell-directed "SEAL Hunter," they will also continue their search for the mole.

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.