VIDEO: Sneak Peek - Tonight's Episode of NCIS: LOS ANGELES

Related: CBS

On tonight's episode of the CBS drama NCIS: LOS Angeles, entitled "Free Ride," Callen, Sam, Kensi and Deeks spend Christmas aboard an aircraft carrier investigating the death of a fellow NCIS special agent. Meanwhile, Nell and Eric make the most of the holidays back at headquarters and Hetty takes a trip, on NCIS: LOS ANGELES, Tuesday, Dec. 18 (9:00-10:00 PM, ET/PT) on the CBS Television Network.

NCIS: LOS ANGELES is a drama about the high-stakes world of a division of NCIS that is charged with apprehending dangerous and elusive criminals that pose a threat to the nation's security. By assuming false identities and utilizing the most advanced technology, this team of highly trained agents goes deep undercover, putting their lives on the line in the field to bring down their targets. Special Agent "G" Callen is a chameleon who transforms himself into whomever he needs to be to infiltrate the criminal underworld. His partner is Special Agent Sam Hanna, a former U.S. Navy SEAL who has seen action in both Afghanistan and Iraq. Assisting the team is the all-knowing Henrietta "Hetty" Lange, who oversees the staff and is tasked with providing everything from micro-surveillance cameras to cars for the team; Special Agent Kensi Blye, the exceptionally bright daughter of a slain Marine who lives for the adrenaline rush that comes with undercover work; Marty Deeks, a seasoned LAPD undercover detective who was recruited to the team by Hetty; Tech Operator Eric Beale, who has mastered every gadget and computer in the Ops Center; and Intelligence Analyst Nell Jones, who won the team's respect with her spot-on intelligence assessments and her shrewd insights. Armed with the latest in high tech gear and sent regularly into life-threatening situations, this tight-knit unit relies on each other to do what is necessary to protect national interests.