STAGE TUBE: Sneak Peek - Season Finale of NCIS: LOS ANGELES

On tonight's two-hour season finale of NCIS: LOS ANGELES entitled 'Sans Voir', Callen and the NCIS: LA team confront their vengeful adversary, the Chameleon, when an undercover case ignites a deadly mind game orchestrated by the criminal mastermind. The episode airs tonight, Tuesday, May 15 (9:00-11:00 PM, ET/PT) on the CBS Television Network. Get a sneak peek below!

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 the recent addition, 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.