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

On tonight's episode of CBS's NCIS: LOS ANGELES titled 'Zero Days,' the NCIS: LA team is called in to determine if the computer system that controls Russian missiles is at risk after Eric overhears his friend, a computer systems expert, being attacked during online game play. Meanwhile, Kensi is shocked when a familiar face from her past shows up in Afghanistan.

The episode airs tonight, Tuesday, March 25 (9:00-10:01 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; Intelligence Analyst Nell Jones, who won the team's respect with her spot-on intelligence assessments and her shrewdinsights; and the newest addition to the team, Owen Granger, the stoic and sometimes irritable Assistant Director, with a mysterious past only known to Hetty.  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.