• Actor LL Cool J plays NCIS Special Agent Sam Hanna in 'NCIS: LA'

Actor LL Cool J plays NCIS Special Agent Sam Hanna in 'NCIS: LA' (Photo : REUTERS/Mario Anzuoni)

"NCIS Los Angeles" Season 6 is not airing a new episode this week. When the series returns, Callen (Chris O'Donnell) and Sam (LL COOL J) are resuming their undercover duties as prisoner and guard. Kensi (Daniela Ruah) is playing Callen's girlfriend to complete their mission.

Spoiler alert: Minor "NCIS Los Angeles" Season 6 spoilers are featured here. Read on only if you're sure you can take it.

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"Kensi transforms herself into a tattooed biker to play the part of Callen's girlfriend," reads the CBS episode synopsis on "NCIS Los Angeles" Season 6, Episode 20. Titled "Rage," the next new episode is also heading down the memory lane.

"Callen's first meeting with Hetty (Linda Hunt) is revealed," the NCIS LA 6x20 synopsis continues. Callen and Hetty have a mother-son relationship albeit in a highly professional environment. How they first met will further enrich character development and cement existing connections in the series.

The core of "NCIS Los Angeles" Season 6, Episode 20 are Callen and Sam. As a prisoner and guard, they "infiltrate a white supremacist group believed to be in possession of stolen nuclear material."

In the most recent episode ("Blaze of Glory"), the team stops young terrorists from wreaking more havoc in the country. Becca Tobin of "Glee" guest stars as Blaze. She attracts Eric Beale (Barrett Foa), sending jealous waves over to Nell (Renee Felice Smith). In the end, Eric finds his way back.

There is more to explore when it comes to Kensi and Deeks (Eric Christian Olsen), who is being investigated by the LAPD. Future episodes of "NCIS Los Angeles" Season 6 are expected to unravel this storyline.

The next new episode "NCIS Los Angeles" Season 6 airs on Apr. 20 on CBS.