Charles "Chip" Sterling

Played by: Michael Bellisario
Seasons appeared: Season 3
Episode #/Name: Frame Up is the climax of the story arc.

Who he is:
Lab assistant to Abby. Former police lab assistant that Tony got fired in his previous job with Baltimore PD. Irritant to Abby: he creeps her out. He wears shoes that let him walk silently. He failed to make it into the military. Plays sport but at a very low level, to the amusement of Tony who played for his College.




Damage he inflicted:

• He framed Tony for Murder and succeeded to the point that Tony was arrested by the FBI
• Therefore Tony went to jail for a small period of time.
  
• Took the legs from a Jane Doe, desecrating the dignity of an unknown dead woman. (Used her as carrion)
• Caused Abby stress.
• Attacked Abby Sciuto when she worked out who he was.

His fate:

Lieutenant Commander Voss, aka Amanda Reed

Played by: Jamie Luner.
Seasons appeared: Season 1
Episode #/Name: 1.19-Dead Man Talking

Who he is:
Lieutenant Commander Voss stole $12million and "died" in a car crash. but instead he changed his identity, to a woman (Amanda Reed) later on, NCIS Special Agent Pacci found a lead to him.

Damage he inflicted:

• He shot and disemboweled NCIS Special Agent Christopher Pacci.
• Psychologically scars Tony by inducing Tony to tongue kiss him, before Tony learns that she is a he.
  
• Makes Gibbs hate himself for not giving Pacci the time and attention that Pacci sought on this cold case, as Gibbs might have prevented the death if Pacci hadn't had to work alone: Gibbs feels too guilty to speak at Pacci's funeral.
• Getting Tony and McGee restrained by a bar full of men.
  

His Fate:
He (he hadn't had the WHOLE change yet) was shot in the head at close blank range by NCIS Special Agent Leroy Jethro Gibbs.

Mamoun Sharif

Enzo Cilenti

Seasons appeared: Season 4
Episode #/Name: 4.07-Sandblast, 4.13-Sharif Returns

Who he is: Worked as an informant for the CIA and is a wanted terrorist

Damage he inflicted:
Obtained 10 kg of BZ gas, a highly toxic chemical weapon and mixed it with DMSO. Poisoned a marine major (who went insane because of the BZ gas and tore out and ate his own eyeball before dying).Poisoned 6 members of the public with a chemically altered version of the BZ gas which didn't kill them. Poisoned Special Agent Gibbs, with the DMSO mixed BZ gas, which almost killed Gibbs. Poisoned 6 members of the public, who survived. He also was nicknamed "The Mad Bomber" by DiNozzo in season 4 because he blew up a golf course at the Army Navy club killing a Colonel and injuring the colonel's son. He also played the CIA and nearly got team Gibbs blown up. Ziva disarms the bomb and then disarms another backpack bomb later in the episode. In that episode he gets away, but is caught later in the season.



His Fate:
Was shot dead by Lt. Col. Hollis Mann.

Yoon Dawson-North Korean Spy: the good villain

Episode #/Name: 3.14- Light Sleeper

Who she is:
Sleeper cell member planted by North Korea

Damage inflicted:
Kills off the other members of the sleeper cell in order to prevent a bombing. Pursues the head of the sleeper cell. Defuses the bomb.

Twist in the tale:
She marries a US Marine for her cover story but turns out that she truly loves him, has a baby with him, became as American as she could and wants to protect her baby's world. She attacks her own spy team to save lives, but is still a spy and thus a criminal. Catch 22.




Her Fate:
we do not know. She may end up advising on North Korean intelligence systems and be adopted as a helper to CIA instead of being prosecuted as a criminal. But she murdered her accomplices (bad) yet they were planning a bombing (preventing that is good). But we know her husband is going to stand by her and wait for her: true love.

D.I. Agent Fred Rinnert

Played by: John Mallory Asher
Seasons appeared: Season 5
Episode #/Name:5.03-The Ex-File

Who he is:
Lab assistant to Abby. Supposedly was ordered there by the DIA, but it is revealed that he requested the job. Irritant to Abby, although they figured out some of the clues together and there was some implied chemistry. Subtle rival of McGee, as he takes his place in helping Abby. The two have a Caf-Pow! drink-off, though we do not know who the winner is.

Damage he inflicted:

His fate:
Unknown, but assumed to be jail. We last saw him when Abby punched him in the nose and he was lead away in handcuffs.

Michelle Lee: The reluctant villain

Played by: Liza Lapira
Seasons appeared: 4, 5, and 6
Episode #/Name: Shalom, Escaped, Dead and Unburied, Once a Hero, Smoked, Friends and Lovers, Angel of Death, Last Man Standing, Collateral Damage, Cloak, Dagger

Who she is: A lawyer who was part of Tony's team when he was team leader. Once Gibbs returned she was placed in the legal department. She sometimes assisted in cases and often delivered warrents. She was part of Gibbs new team in season 6 when he was searching for a mole. She killed 2 men making it look like one of them was the mole, when actually it was her. "They" kidnapped her younger sister and were forcing her to betray her country.

Damage inflicted:

• Killed Agent Langer and Petty Officer Stephen Vargo
  
• She betrayed her country
• Made Gibbs doubt himself (over Agent Langer)