BEWARE OF SPOILERS. Due to the nature of the show, with its many Walking Spoiler characters, twists, and turns, the only spoilers whited out are those for the current season "24: Live Another Day". Proceed with caution!
The station chief of the CIA's station in West London, England during Day 9.
- Ain't Too Proud to Beg: He turns into a pleading wreck, begging Jack to save him, when Kate pulls a gun on him as a ruse to get him to give up the tracking code of the override device.
- Asshole Victim: Even he isn't killed right away and about to face the death penalty for being an actual traitor, he deserves every second of torture at the hands of Bauer, no pun intended.
- Benevolent Boss: Navarro is apologetic toward Kate regarding hear transfer, and otherwise comes across as a considerate and even-tempered man. It's eventually subverted when he turns out to be The Mole.
- Bad Boss: On top of the framing job, he also takes out a hit on one of his own analysts once he starts snooping around.
- Bitch in Sheep's Clothing: He had been pretending to be Kate's friend all the while he'd been responsible for framing her husband and generally acts like reasonable, benevolent guy to cover up the ruthless, selfish bastard he truly is.
- Da Chief: Of the CIA in London.
- Fingore: Jack inflicts an absolutely brutal version of this on him with the butt of his gun.
- Genre Blind: He walks straight into this trope when he is caught, thinking he can make smug demands of Jack Bauer. It ends about as well as you'd expect for him.
- It's All About Me: His only concern when there's a device on the loose that could very well start a nuclear war? Making sure he gets immunity for his many, many crimes.
- Lack of Empathy: It's clear he couldn't care less about all the damage he's caused or about the untold millions who will die if the override device isn't found.
- Oh, Crap!: He has a big one when both Jordan Reed's and his hitman's bodies are found by police, and decides to flee the country before he gets caught for being The Mole.
- He has an even bigger one later when Kate and Jack get him to give up the tracking code of the override device. The look on his face when he realizes he's just given up his once chance of escaping the Death Penalty is beautiful.
- Reasonable Authority Figure: At least when it came to stopping Margot, as even after the viewer discovers his status as The Mole and he begins working to keep the truth about himself from coming out, he still also ends up being beneficial to everyone else in stopping her threat with the drones. Once she's out of the picture however, this no longer applies.
- The Mole/Mole in Charge: He framed Adam Morgan and is working with Adrian Cross.
- Shirtless Scene: Sure he's an evil traitor, but damn.
- Smug Snake: He arrogantly states that the only way he'd give up how to find the drone override device is if he was granted a full pardon from the President. Kate and Jack quickly proved him wrong.
- The Sociopath: Possibly the best one in the series. He's superficially charming, a talented liar and manipulator, arrogant and self-absorbed with a high opinion of himself, completely unconcerned with who gets hurt as a result of his actions, and he can frame innocent people, lie, deceit, steal and even commit murder with no hint of remorse.
- Tall, Dark, and Handsome: Comes with being played by Benjamin Bratt.
- Too Dumb to Live: So Steve gets caught for multiple crimes that will get him the Death Penalty and he's being questioned by a man whom he knows will do anything to get the information he needs from him and is very, very skilled at it but is offering him a lifeline? Does Steve immediately start talking? No, he arrogantly insists on a full immunity deal and brags about how Jack can't touch him. Jack responds by smashing his fingers to pieces and getting the information he needs a different way.
- Uriah Gambit: Pulls this on Jordan Reed when he starts poking around the Adam Morgan files too much.
- Walking Spoiler: See all those spoiler highlights? There's a lot about him the viewer or most of the characters don't know until much later.
- You Have Outlived Your Usefulness: Steve finds himself on the receiving end when Adrian Cross abandons him to be apprehended by his own former subordinates after delivering the override device to him.
The CIA agent and the wife of disgraced CIA officer Adam Morgan, until his apparent suicide.
- Action Girl: Kate is ridiculously badass, which comes with being the lead field agent and being a Distaff Counterpart to Jack Bauer.
- Anti-Hero: Seeing as how she follows many of the similar principals Jack does when it comes to saving the day, it's practically a given.
- Cowboy Cop: When a criminal won't talk, Kate ignores orders to release him and instead drives him to the headquarters of a gang that wants him dead, threatening to leave him there unless he talks.
- Dark and Troubled Past: We first see her packing up her stuff, because she's been relieved of duty and is being shipped back to the States. Turns out her husband, Adam, killed himself—after he was convicted (wrongly) of selling intelligence to the Chinese.
- Despair Event Horizon: After failing to protect Audrey, she breaks down in tears and at the end of the day, resigns from the CIA, even though Ritter had said it wasn't her fault.
- Distaff Counterpart: To Jack, possibly even moreso than Renee Walker. Whereas Renee initially found herself torn between staying by-the-book or bending the law to get results like Jack did, Kate has no such scruples and easily leans toward the latter decision. And like Jack, she also has the drive of avenging her spouse.
- Good Is Not Nice: Kate isn't a Jerkass, but in her determination to achieve her goals she can lose patience with people.
- Hero Antagonist: As far as she knows, Jack is a traitor who's trying to kill the president, so she does her best to stop him, unaware that she's only interfering with his attempts to stop the true villains.
- Deuteragonist: Once she (as the good guys always do) figures out that he's telling the truth and needs her help.
- It's Personal: Upon discovering that Steve framed her husband, she really doesn't take it well, and wants to explicitly make sure he doesn't get any sort of pardon for his crimes
- My Greatest Failure: Not noticing that she was married to a Double Agent. But in fact her husband was framed by her boss, Steve Navarro.
- Oblivious to Love: Jordan has a crush on her, but Kate seems unaware of it (although Navarro has noticed).
- One Last Job: Though she isn't a criminal but like Jack, she has been pull off active field duty and was set to be retired. However, she asked to catch Jack Bauer when he reappeared in London, and becomes his partner after getting official help from President Heller regarding the hi-jacked Drones.
- One Steve Limit: She shares the same namesake as Kate Warner, Jack's Love Interest from Day 2 and 24: The Game.
- Redemption Quest: Her being assigned on the hunt for Jack is to prove herself after her name was tarnished due to her husband's actions. Of course, she's also very sharp, with the same quickness and intuition as Jack.
- Revenge Before Reason: She intentionally invokes this to get Navarro to fear that she's willing to kill him in revenge for framing her husband and give up how to find the override device. The ploy works.
- Suspiciously Similar Substitute: Lessee... another Distaff Counterpart to Jack who's finding herself repeatedly butting heads with him? Some fans have already taken to calling her Renee 2.0.
The ranking CIA field operative at the agency's London, England station during Day 9. Ritter was scheduled to succeed Kate Morgan following her demotion.
- It's All About Me: Seems less concerned with locating Bauer, and more with getting his promotion. He eventually moves past this attitude.
- Jerkass: Primarily towards Kate. He's aggressive, condescending and short-tempered. However, over the course of the series, it transforms into...
- Jerk with a Heart of Gold: As stated below, he does eventually soften up when working with Kate, and he does value the lives of his teammates, as evidenced when he gets pretty upset upon discovering that Jordan has been killed.
- The Rival: To Kate, considering that her presence is putting his promotion on hold. It does take him a while to warm up to her.
- Teeth-Clenched Teamwork: originally. Only a few episodes in, and he's already beginning to soften as Kate's judgment is proven trustworthy. It's arguably a Call-Back to the Jack-Tony dynamic from the first season.
- You Are in Command Now: Takes over as station chief after Navarro's arrest.
The CIA Intelligence analyst at the agency's London, England station during Day 9.
- All Love Is Unrequited: He has a crush on Kate, which she isn't aware of.
- Character Death: Navarro orders him killed by a hitman. Jordan manages a Mutual Kill before he succumbs.
- Dying Alone: He's actually still alive in spite of the stab wound Navarro's hitman gives him at the end of the 6:00 pm - 7:00 pm hour, and succumbs to it offscreen sometime shortly after that.
- He Knows Too Much: He nearly uncovers evidence that Kate's husband was framed, so Steve Navarro sends a hitman after him.
- Mutual Kill: With his boss's hitman.
- Not with the Safety on, You Won't: Costs him dearly in his final confrontation with the hitman his boss has sent to kill him. When the assassin points it out, Reed hesitates trying to find it and gets stabbed.
- Office Romance: He has feelings for his co-worker Kate.
- Sacrifical Lion: His death ends up eventually leading the others to discover Navarro's treachery, and in turn begins the last act of Day 9.
- Spear Counterpart: To Chloe.
- Voice with an Internet Connection: He's the resident tech guy at the CIA, which means most of his job is this.
- Suspiciously Similar Substitute: Downplayed, as he actually does appear right before Jordan's death,, but he does gain more prominence and begins directly helping Jack after this happens.
- Voice with an Internet Connection: It's a given seeing as how he's another major systems analyst at the CIA. He directly serves in this role to Jack in the last third of Day 9, what with Chloe unavailable for most of it due to her being held hostage.
A CIA worker during Day 9. She appears to function as the London office's Chief of Staff, as she often deals with personnel and administrative matters while reporting directly to Section Chief Steve Navarro.