Nikita: Season 1, Episode 8

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Nikita fails to stop Thom from assassinating Anna Harcourt, the intern and mistress of a U.S. Senator. Thom later graduates to an agent. Nikita later realizes the killing may have been justified after she is captured by a couple masquerading as her parents. They and Harcourt are agents for Gogol, an organization apparently more dangerous than Division. Nikita awakens to find herself infected with a toxin that would liquify her stomach within 12 hours, and she would only be cured if she assassinates the Senator. Fortunately Alex steals the antidote and plants it on Thom; Nikita knocks him out while protecting the Senator, and takes the antidote. The Gogol leader, Ari Tasarov (Peter Outerbridge), later asks Nikita to join them and stop Division together, but she refuses.