Chloe O'Brian is a fictional character played by actress Mary Lynn Rajskub on the US television series 24. She is one of the few people Jack Bauer trusts, often doing unconventional and unauthorized favors for him. She displays extraordinary mastery of computer hardware.

Spending most of her time behind a computer terminal, she is rarely sent on field assignments; however, she has demonstrated proficiency with weapons in Day 4 & 5. Despite her lack of social graces, Chloe has gained several friends at CTU and has shown to have a great deal of loyalty to them. She helped CTU Agent Chase Edmunds take care of his daughter from a previous relationship after the child's mother abandoned Chase and their child.

She even tried to pass the child off as her own, so as to keep Chase's then-girlfriend, Kim Bauer, from knowing about Chase's offspring. (Chase did not want Kim to know about his daughter's existence, out of fear that she would leave him.) She also has a complicated friendship with CTU Agent Jack Bauer. In the beginning, Jack thought of Chloe as an annoyance, though that didn't keep him from using Chloe to engage in unauthorized use of CTU computer resources without their superior's permission.

The relationship was one-sided initially, in terms of Jack using Chloe and demanding that Chloe risk her career on her blind faith that Jack was right. Chloe would reluctantly follow Jack's demands and ride out the problems they would make for her with her boss until Jack's requests from her yielded the results that he promised they would.

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