Alexandra (Alex) Udinov is a heroine from the TV series, Nikita.
Early life, On The Run, & Saved By Nikita
Alex is the daughter of the late exiled Russian oligarch Nikolai Udinov and his wife who were murdered when Alex was a child. Nikolai owned the billion-dollar company Zetrov, which Alex was the sole heir of. She was saved by Nikita as she watched the rest of her family perish. Nikita was powerless to save Alex from anything else as she had to return to Division, and Alex was sold into sex slavery at her very young age by one of her father's former associates.
To keep her from fighting against them, the slavers keep Alex with them by keeping her high and eventually forcing her to become a drug addict. For a few years, she has no choice but to stay with them to get her next fix. Nikita later resces her, as she tried years before, and forces her to become clean, but to Alex's irritation.
Alex brings this up to Amanda, saying that the slavers "had the decency to keep [her] high" as they held her captive, comparing this to Division. She also suffers panic attacks due to certain things that trigger somewhat supressed memories of her past, such as being under a car reminding her of being under her bed as she watched her family die.
After Nikita succeeds in helping Alex past the worst part of her addiction, she starts to train her both mentally and physically to be fit enough and intelligent enough to stay one step ahead of Division when she is inserted there.
Working For Division & Double Agent
Currently, Alex is working with Division to gather the intel and resources she needs to reclaim her birthright. She claims that she is merely using Division (although Amanda would argue otherwise) but has gone on a number of missions for them.
Alex, through a series of events, is also being manipulated by Percy. At this point, through blackmail, Percy seems to have his claws around Alex. Where Alex was once a mole for Nikita, she appears to be becoming one for Percy instead.