Highlights from the Eighteenth Episode of Season 5 of NCIS: LA

Eric’s college friend Ira Wells is a hacker who finds flaws in computer systems, called zero days, which are sold for profit to third parties.

Season 6 Episode 18 Photos - NCIS Los Angeles

Season 6 Episode 18 Photos - NCIS Los Angeles

Pictured: Daniela Ruah (Special Agent Kensi Blye). 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, on NCIS: LOS ANGELES, Tuesday, March 25 (9:00-10:01 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved.

"Zero Days" S6 E18

Pictured: Eric Christian Olsen (LAPD Liaison Marty Deeks) and Barrett Foa (Tech Operator Eric Beale). 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, on NCIS: LOS ANGELES, Tuesday, March 25 (9:00-10:01 PM, ET/PT) on the CBS Television Network. Photo: Sonja Flemming/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved.

"Zero Days" S6 E18

Pictured: Eric Christian Olsen (LAPD Liaison Marty Deeks) and LL COOL J (Special Agent Sam Hanna). 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, on NCIS: LOS ANGELES, Tuesday, March 25 (9:00-10:01 PM, ET/PT) on the CBS Television Network. Photo: Sonja Flemming/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved.

"Zero Days" S6 E18

Pictured: Eric Christian Olsen (LAPD Liaison Marty Deeks). 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, on NCIS: LOS ANGELES, Tuesday, March 25 (9:00-10:01 PM, ET/PT) on the CBS Television Network. Photo: Sonja Flemming/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved.

"Zero Days" S6 E18

Pictured: Linda Hunt (Henrietta "Hetty" Lange). 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, on NCIS: LOS ANGELES, Tuesday, March 25 (9:00-10:01 PM, ET/PT) on the CBS Television Network. Photo: Sonja Flemming/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved.

"Zero Days" S6 E18

Pictured: Miguel Ferrer (NCIS Assistant Director Owen Granger). 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, on NCIS: LOS ANGELES, Tuesday, March 25 (9:00-10:01 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved.

"Zero Days" S6 E18

Pictured: Barrett Foa (Tech Operator Eric Beale). 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, on NCIS: LOS ANGELES, Tuesday, March 25 (9:00-10:01 PM, ET/PT) on the CBS Television Network. Photo: Sonja Flemming/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved.

"Zero Days" S6 E18

Pictured: Daniela Ruah (Special Agent Kensi Blye) and Matthew Del Negro (Jack Simon). 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, on NCIS: LOS ANGELES, Tuesday, March 25 (9:00-10:01 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved.

"Zero Days" S6 E18

Pictured: Daniela Ruah (Special Agent Kensi Blye) and Matthew Del Negro (Jack Simon). 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, on NCIS: LOS ANGELES, Tuesday, March 25 (9:00-10:01 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved.