DC Database

Quote1 They call me Killer Frost. Let me show you why. Quote2
Caitlin Snow src

Caitlin Snow is a scientist at S.T.A.R. Labs and a member of Team Flash. She developed cryogenic powers and a alternate personality after her father used cryogenic research to freeze the progression of her ALS disease. After the Flashpoint, her persona Killer Frost emerged and become an enforcer for Savitar. Eventually, Caitlin has gotten herself and her powers under control and dropped the Killer, becoming simply Frost, until her personality was separated by Mirror Monarch and later killed by Deathstorm. She tried to ressurect Frost with the help of Mark Blaine, creating another personality named "Khione" instead; a god-like being with elemental powers.[1]


Caitlin is the daughter of the scientists Carla Tannhauser and Thomas Snow. In 1999, Caitlin developed an alternate personality named Khione as the result of her father's researches on a ALS cure. Her personality was suppressed for most of her life and her father eventually "died".[2]

As an adult, Caitlin moved to Central City and acted as the S.T.A.R. Labs resident chemist and analyzed Metahuman samples. She was engaged to Ronnie Raymond before his disappearance during the particle accelerator explosion.

Star City

Caitlin, along with her frequent colleague Cisco Ramon, first met with Felicity Smoak during one of her trips to visit the comatose Barry Allen. Caitlin worked for S.T.A.R. Labs, and was tasked with performing an inventory of a Starling City warehouse belonging to S.T.A.R. Labs, along with Cisco. Deathstroke showed up to the warehouse, and Caitlin mentioned an energy gun designed by Arthur Light that they could use to stop him. Cisco and Caitlin reported the incident to Felicity Smoak and John Diggle. Caitlin was visibly angry at Felicity for knowing who that man was. Felicity later showed up to Cisco and Caitlin, asking them to make a Mirakuru cure.

The Reverse-Flash

Caitlin tended to Barry Allen during his coma with Cisco until he woke up. After he began his crusade as "The Flash" Caitlin became a member of his team with Cisco and Dr. Harrison Wells, before discovering the latter's identity as Eobard Thawne, and provides medical support for the team. Close to season final, she was reunited with Raymond, but he sacrificed himself shortly after.


After Ronnie's death, Caitlin began to form a romantic relationship with Jay Garrick, whom she tried to help regain his access to the Speed Force. In order to do this she developed the chemicals Velocity 9 through Velocity-11, which could only give him speed for a limited time. As it turned out, Garrick was really the villain Zoom, and he kidnapped Caitlin and took her to Earth-2, where she formed a shaky alliance with her counterpart Killer Frost. The two nearly escaped Zoom's prison, but they were caught and Killer Frost was killed and Caitlin was taken to the Central City Police Department as a captive. She eventually talked Zoom into allowing her to leave, and she then resumed her place at S.T.A.R. Labs, and helped The Flash take Zoom down.

Savitar and Killer Frost

Caitlin Snow Arrow 002

Caitlin becoming Killer Frost

In the Flashpoint timeline, Caitlin is not a scientist but is a doctor who is unwillingly brought into Ramon Industries by Barry to help him restore the timeline. Following Barry's attempt to restore the timeline, Caitlin is once again a scientist at S.T.A.R. Labs, but also seemingly from changing time again she is also a meta-human with abilities similar to her Earth-2 doppelgänger, who she is afraid of becoming like. However, it's also implied that she could have been affected prior to Flashpoint. After being taken over by her rising anger while using her meta-human powers, losing control of her emotions, she briefly started going by her doppelgänger's name Killer Frost.

Caitlin Snow Arrow 0004

Caitlin as Killer Frost

After suffering a clinical death from a seizure and subsequently being revived by her regenerative powers, her biochemistry was altered, culminating in her becoming fully consumed by her anger as Killer Frost, later encountering and allying with Savitar after the proclaimed speedster god reveals his true identity as a future version of Barry Allen. Later, between Cisco giving Caitlin the choice to cure herself rather than force it on her and watching Savitar nearly kill him, Caitlin finally regained her true personality and control of her powers. Despite this, Caitlin decided not to take the cure. Feeling lost to her own identity, Caitlin left Team Flash on good terms to rediscover herself. She eventually joined Amunet Black's criminal organization.

The Thinker

Six months later, having seemingly come to terms with her mistakes as Killer Frost, Caitlin finally decided to re-join Team Flash, only to discover that her Killer Frost-side had returned.

Shortly after returning to Team Flash, Caitlin once again began to struggle with her Killer Frost side and eventually lost control. Iris West convinced both Caitlin and Killer Frost that they could try to be the same person instead of choosing one life or the other. As such, when preparing to serve as back up to Barry along with Cisco she stated "Snow and Frost standing by" emphasizing that both Caitlin and Killer Frost were prepared to work together to help. When Nazis from Earth-X tried to invade Earth-1, she aided her friends in the battle that followed, earning Mick Rory's affection. In a battle against Clifford DeVoe aka The Thinker, she lost her Killer Frost side as a result of DeVoe using Dominic Lanse's powers to create a mental block. After defeating Siren-X from Earth-X, Caitlin discovers that Killer Frost is still inside her, without the presence of dark matter. She later learns, from a suppressed memory, that Killer Frost has been with her since childhood, before she was exposed to the dark matter released by the particle accelerator.


After defeating DeVoe and getting Ralph Dibny back, Ralph discovered that Caitlin father's death certificate was a fake and that he was actually alive. Barry, Cisco and Caitlin eventually found him hiding out in an old warehouse. However, he later revealed himself to be Thomas' evil alternate personality and attempted to kill the team and take over Thomas' body completely. During the fight, Caitlin managed to break through the mental block that DeVoe had created and regain Killer Frost. During a fight with Cicada, Team Flash discovered that Killer Frost is immune to his dagger and could help defeat him.

Roy Harper Cry for Justice
There's something missing here. This section of the article is incomplete, and contains information, but requires more before it can be considered complete. You can help DC Database by editing this page, providing additional information to bring this article to a higher standard of quality.

The Crisis

Roy Harper Cry for Justice
There's something missing here. This section of the article is incomplete, and contains information, but requires more before it can be considered complete. You can help DC Database by editing this page, providing additional information to bring this article to a higher standard of quality.

Mirrorverse and Separated

During Mirror Monarch's uprising, Frost was hit by the supervillain's abilities[3] A week later, Caitlin began suffering from headaches which caused her great pain: after the attack of Fuerza, Caitlin and her alternate personality separated from one another so that Frost now inhabitated her own body.[4]

The two asked Cisco scientific explanations about their separation but he was left shocked[4] as well as the other members of Team Flash: Caitlin discovered that the mirror blast induced Frost's cells to replicate themselves enough to create a living body body, severing their telepathic connection so that they could not hear each other thoughts anymore.

She caught Cisco trying to alter the Firestorm Matrix to make it able to fuse her with Caitlin once again; however, Frost decided to destroy the artifact as she wanted to live her own life, upsetting Caitlin. Kristen Kramer was trying to arrest her for her actions as Killer Frost: despite Joe's warnings, Frost was unimpressed and replied she was waiting for her.[5][6]

Atom Ryan Choi 0027

This section of the article does not provide a complete profile of the subject. You can help out by providing additional information, expanding on the subject matter in order to bring this article to a higher standard of quality.

This template will categorize articles that include it into Category:Incomplete Articles.


Caitlin Snow Arrowverse 009


When Caitlin tried to resurrect Frost with Mark Blaine's help by entering the Consciousness Resurrection Chamber, a new personality named "Khione" emerged from her body after a malfunction in machine. This personality originally used the alias "Snow". Her powers appear to be nature-based, and according to Carla Tannhauser, she is neither a human or a meta-human, due to their being no traces of dark matter or cold fusion energy present in her cells, making the origin of her powers unknown. However, Khione later developed ice-based powers like Frost and eventually joined Team Flash.

Roy Harper Cry for Justice
There's something missing here. This section of the article is incomplete, and contains information, but requires more before it can be considered complete. You can help DC Database by editing this page, providing additional information to bring this article to a higher standard of quality.



  • Genius Level Intellect: Proof of her genius mind is that Eobard recruited her to his S.T.A.R. Labs team, and he only took the best and brightest minds.
    • Computer Operation: As a member of S.T.A.R. Labs, Caitlin has some technological skills of note, albeit not her main area of expertise. This is evident in her ability to reprogram the S.T.A.R. Labs satellite to track meteorological abnormalities over Central City in order to locate Clyde Mardon. Caitlin was able to determine that Ramsey Deacon's powers produced an organic virus and helped Cisco to create a compound to invert it.
    • Medicine: Caitlin is an expert in medical care and acts Team Flash's medical support. Caitlin monitored Barry Allen's condition while he was comatose. She was also able to cure him when he was poisoned by Kyle Nimbus and patch him up when he was seriously injured by Tony Woodward, including setting his shoulder back into place. Caitlin was also able to patch up Eobard Thawne after he was brutally beaten up by his Reverse-Flash speed mirage. Caitlin once mentioned that she knows how to perform a lobotomy, a procedure that requires both training and skill in the field of neurosurgery. Caitlin even had the ability to potentially surgically extract a thermite bomb from Lisa Snart's head. Caitlin is well-trained in obstetrics, as shown when she monitored Cecille Horton's pregnancy after the latter gained meta-human powers. Caitlin was even able to successfully deliver Jenna West at S.T.A.R. Labs.
  • Intimidation: Caitlin lately uses the threat of unleashing Killer Frost to get people to back off. As Killer Frost, her icy glare is enough to scare regular people into silence. However, arrogant or rightfully confident people are not scared of her.
  • Hand-to-Hand Combat (Advanced): During the six months in which she worked as an enforcer for Amunet Black, Caitlin as Killer Frost developed a measure of sheer hand-to-hand combat skills when she reversed an arm bar Norvok exerted upon her, slamming and pinning him painfully against a pinball machine. Caitlin was able to hold her own and even briefly push back Orlin Dwyer. Caitlin even managed to hold her own against an older Grace Gibbons for a while, but was eventually overwhelmed.
    • Swordsmanship: During the Earth-X invasion, Killer Frost was able to create ice swords and take down multiple Nazis with ease.
    • Firearms: Caitlin displayed incredible accuracy when armed with a Cold Gun, able to incapacitate a riled-up Barry running wildly around S.T.A.R. Labs after he gained enhanced super-speed, something even Cisco was unable to accomplish with his vibrational blasts. After Clifford DeVoe seemingly took away her powers, Caitlin began occasionally the Cold Gun as her primary weapon of choice when operating in the field.


  • Multiple Personalities (Formerly)
  • Power-dampening tech (Formerly)
  • Photon rifle (Formerly)
  • Flashtime: (Formerly) Killer Frost can't use her powers while moving at high speeds since this causes friction between her atoms and friction creates intense heat under these circumstances.


  • Killer Frost suit (Formerly)




Ambush Bug 07
DC Rebirth Logo

This is an in-universe article with out-of-universe material.

This article covers information about something that exists within the DC Universe, and should not contain out-of-universe material. Please remove all out-of-universe material, or include it in a separate section at the bottom of the article. And take off that silly costume.
Flash Logo 01
DC Rebirth Logo
Flash Family member

This character is or was an incarnation of or an ally of The Flash, and a member of the Flash Family of speedsters. This template will automatically categorize articles that include it into the "Flash Family members" category.

Rogues 0005
DC Rebirth Logo

Flash Villain(s)
This character, team, or organization, is or was primarily an enemy of any or all of the various incarnations of the Flash. This template will categorize articles that include it into the category "Flash Villains."