In Season 2, Episode 6 of "NCIS: Los Angeles," titled "Standoff," Marisol Nichols portrays Callen's (Chris O'Donnell) old CIA partner who has found herself in hot water. Tracy Keller (Nichols) first appears holding a Navy Recruitment Center hostage at gunpoint. When Callen arrives, she tells him that she actually needs his help because a white supremacist group is after her. Though she seems convincing at first, the team soon comes to realize she has spun a complicated web of lies so she can escape to the Cayman Islands with a cache of money.
There is no white supremacist group. As it turns out, the entire story was a plot concocted by Tracy as a coverup for her deal with an arms dealer. Along the way, Tracy kills FBI agents and tries to use her past relationship with Callen to manipulate the situation to her advantage, making her the prime antagonist of the episode. Nichols demonstrates her great propensity for complicated characters who are out for themselves. She sells each lie that she tells effortlessly and although she is found out in the end, she makes for an interesting and captivating villain.
