An analyst at CTU Los Angeles (and later New York), she is Jack Bauer's most trusted colleague, often doing unconventional and unauthorized favors for him, even at personal risk to herself.

In interviews to promote the show's return to Fox with the miniseries, 24: Live Another Day, actor Kiefer Sutherland revealed that Rajskub would be reprising Chloe, but hinted that the relationship between her and Jack Bauer would be more adversarial than before.

When the crisis ends later in the day, she, along with Michelle Dessler, Tony Almeida and former President David Palmer, help Jack to fake his death.

[3] She is briefly arrested for aiding Jack, though her skills with computers allow her to avoid the consequences of her actions and returns to work at CTU.

She is able to slip into the bathroom just before being caught red handed, but Homeland Security bureaucrat Miles Papazian is very suspicious that she is deliberately interfering with their orders to attempt to apprehend Jack, at that time subject to a warrant by President Logan.

Karen Hayes contacts Bill to alert them that Papazian has sent a team to arrest Chloe and that she has mere minutes to leave the house.

Combined with Hayes, she works to help Jack locate the passenger on a private plane in possession of the audio tape implicating Logan in Palmer's death.

Hayes and Buchanan bring Chloe back to CTU shortly thereafter to help Jack make an emergency landing, because Logan has ordered an F18 to shoot down the plane.

When chatter is intercepted between Fayed and Darren McCarthy, a profile of the man able to arm the four remaining suitcase nukes is sent, though the message is badly degraded.

After Morris downloads an illegal program that will speed up the reconstruction of the data, he leaves, and Chloe kisses him goodbye.

Chloe works to help locate Morris, who was tortured by Fayed into programming a device which would allow the detonation of the suitcase nukes.

Chloe gives Jack the needed information in how to disable the suitcase nuke Fayed left behind after CTU assaulted his safe house.

Morris tells Chloe that he ended their relationship because he felt that neither of them would be able to move past the fact that he had armed the nuclear weapons.

Actress Mary Lynn Rajskub revealed her role in the upcoming seventh season: “I show up, time has passed and I have a 4-year-old and a wedding ring, [and I'm] calling Morris (Carlo Rota) while I'm busy.

"[10] Chloe was working with Bill Buchanan and Tony Almeida who was undercover with Emerson's gang, to uncover the conspiracy within the US government who had been supporting General Juma and his regime in Sangala, Africa.

Chloe co-ordinates numerous operations for the team, until later they become compromised through their efforts to secure the CIP device used by Juma's henchman, Dubaku to launch attacks on America.

Jack enlists Chloe's help while he follows a lead on Ryan Burnett — a US-based conspirator named as a traitor in the files retrieved from Dubaku.

"[11] Chloe's arrest allowed her to be temporarily written out of the show so that Rajskub could go on maternity leave; meanwhile, Morris takes over her role in the story.

Chloe quickly goes head-to-head with her co-workers when evidence is uncovered that implicates journalist Meredith Reed (Jennifer Westfeldt) in an assassination plot against President Omar Hassan (Anil Kapoor).

As it turns out, Chloe's instincts are proved correct, leading CTU to the actual assassin, and Hastings formally apologizes and commends her actions in the official logs.

This new dynamic is put to the test within two hours of her promotion, when Jack steals a helicopter to pursue justice in direct defiance of orders from President Allison Taylor (Cherry Jones).

Chloe sticks with the responsibilities of her position, ordering pursuit instead of supporting Jack; this is the first time in several years the two have pursued clashing goals.

Coordinating with Cole Ortiz, she tries to get evidence collected by Jack vital to expose the cover up, but is stopped by Jason Pillar and CTU.

Since being arrested for helping Jack escape, she has become a member of the free information movement and is working with a hacker group named Open Cell, which devotes itself to exposing government secrets.

Her new goals are a stark contrast to the loyal CTU agent Chloe once was; it is suggested she was betrayed by the American government, at one point telling Jack not to judge her "after what [she's] been through."

Jack, allowing himself to be captured to gain access to the facility, frees her and then follows her to the hideout of Open Cell's leader, hacker Adrian Cross (Michael Wincott).

By this time, Yates had already managed to commandeer a U.S. drone and fire upon a military convoy in Afghanistan, killing two American and two British soldiers.

In the show's third episode, Jack discovers Yates' corpse, left behind by his female companion, Simone Al-Harazi (Emily Berrington).

Together, they return to Open Cell's headquarters in order to establish a cover for Jack to infiltrate the U.S. embassy in London and question Lieutenant Chris Tanner (John Boyega), the man Yates had framed for the drone attack.

Chloe manages to hack into Al-Harazi's video feed from her drone's cameras and fake President Heller's death and then track her with Adrian Cross' help.