Frost (Caitlin Snow)

Caitlin Snow is the current Killer Frost, but has reduced her identity to Frost once she became a heroine.
Killer Frost was created by Gerry Conway and Al Milgrom, first appearing in Firestorm #3. However, in the Prime Earth continuity, Killer Frost first appeared as part of the New 52 DC Universe in Fury of Firestorm: The Nuclear Men #19 by Dan Jurgens.
==History==
Caitlin Snow was a young and bright scientist working for S.T.A.R. Labs assigned to an underfunded S.T.A.R. Labs Outpost #72 in the Arctic Circle, where the deceased researcher Dr. Louise Lincoln had been working on a Self-Sustaining Thermodynamic Ultraconductor Engine that could subvert the second law of thermodynamics in order to create perpetual motion. Caitlin became interested in continuing Lincoln's work, in spite of her colleagues warning her against it.
When Caitlin succeeded in finishing the S.T.U. engine, her colleagues turned on her and revealing themselves to be working for H.I.V.E., as they were expected to ensure that the engine was never made public in order to protect H.I.V.E.'s investments in the energy industry. Furthermore, they were also responsible for Lincoln's death, and they then proceeded in silencing Caitlin by placing her in the working S.T.U. engine. In a panic, Caitlin ripped out the wires for the engine's coolant system, consequently infusing her biological makeup with ice. As a result, she became a vampiric being who craved for heat, and killed the H.I.V.E. agents.
After carrying out her vengeance, Caitlin continued to search for other sources of heat; she attacked a Norwegian research camp and stole their helicopter to fly to her hometown of Pittsburgh, where she encountered and fought Firestorm. While fighting Firestorm, Caitlin discovered that Firestorm's powers can temporarily heal her condition, and devoted her time to seeking and confronting him. She soon learned about the Firestorm Matrix and attempted to recreate it.
===Justice League of America===
Killer Frost was captured at some point after, and transported to Belle Reve where she was forced to join the Suicide Squad. After reforming and saving the world from Eclipso, Batman had her released on parole from Belle Reve and she joined the new Justice League of America.
After joining the new Justice League of America, Caitlin found herself often in tense company as few of the team immediately trusted her. Black Canary initially mistook her for a rogue criminal when she and Batman attempted to recruit her, while Lobo remained openly antagonistic towards her, despite his own much greater history of violent supervillainy. Besides Batman, the only teammate who was completely nonjudgemental of her was Ryan Choi, the new Atom, with whom she made an immediate connection with due to their shared scientific expertise, and the two became quick friends.
Caitlin quickly developed romantic feelings for Choi, who reciprocated them, though his inexperience with women and low self esteem caused him to be completely oblivious to Caitlin's attraction to him, while Caitlin was too ashamed of her past and her condition to make her feelings known. Their teammates, though, all picked up on their attraction. Together, the two swore to aid the other in both their respective personal objectives, for Caitlin this was curing her condition, and for Ryan it was locating his lost mentor, Ray Palmer.
During one adventure, when their lives were in danger, Caitlin confessed her feelings to Ryan, who in-turn reciprocated, and the two began a slow and steady relationship, as they were unable to be physically intimate due to Caitlin's condition. As time went on, Caitlin became increasingly agitated by her condition, until the team were attacked by Prometheus, who took each member down systematically. Using Caitlin's condition and her reliance on external heat against her, he tricked her into a room that was below freezing, causing Caitlin's body to begin shutting down. When Ryan and Black Canary managed to free her, she was so drained she couldn't control her heat vampirism, and was forced to drain Afterthought to near death in order to stabilise herself.
This event left Caitlin scared enough of her powers that she ended up agreeing to a bargain with Queen of Fables to cure her condition; however, unable to sacrifice the world for her own sake, she reneges on the deal and helps the Justice League of America defeat her, at the cost of her cure. The experience, however, leads to her re-evaluating her condition, choosing to view it as a chronic condition she needed to manage rather than a disease she needed to cure.
===Dark Crisis ===
On Christmas Eve, Killer Frost was on monitor duty with Firestorm at the Hall of Justice. Following the disappearance of the Justice League, with Black Adam claiming that they were killed by Pariah, Caitlin was recruited by Jon Kent into his new Justice League, which she accepted. After Deathstroke and his army of supervillains destroyed Titans Academy, Black Adam took control of the new League. However, when he told the League that they would need to kill their enemies in order to be effective, most of them refused. This infighting caused the team to quickly disband.
==Relationships==
*S.T.A.R. Labs - Former Employer
*Suicide Squad - Former Teammates
*Bruce Wayne/Batman
* Justice League - Former Teammates
*Dinah Drake/Black Canary - Former Enemy turend Ally
*Ryan Choi/Atom - Close Friend and Love Interest
*Queen of Fables - Ally turned enemy
*Black Adam - Enemy
*Pariaha - Enemy
* Jon Kent - Ally
*Deathstroke - Enemy
*Black Adam - Former Leader and Enemy
*Louise Lincoln - Former Idol
*H.I.V.E - Former Unknown Colleagues, Attempted Killer and Victims
==Other Versions==
===Series===
*The Caitlin Snow incarnation of Killer Frost appears in the Justice League Action episode "Freezer Burn", voiced by Mena Suvari
====Arrowverse ====
Danielle Panabaker portrays Dr. Caitlin Snow in media set in the Arrowverse. Following initial guest appearances in Arrow and primarily appearing in The Flash, this version is a member of a Central City-based S.T.A.R. Labs team alongside Cisco Ramon / Vibe and Harrison Wells, which supports Barry Allen / Flash.
===Games===
*The Louise Lincoln incarnation of Killer Frost appears as a playable character in Justice League Heroes, voiced by Nika Futterman.
*The Louise Lincoln incarnation of Killer Frost appears as a boss in DC Universe Online, voiced by Christina J. Moore.
*The Louise Lincoln incarnation of Killer Frost appears in Injustice: Gods Among Us, voiced by Jennifer Hale
*The Crystal Frost incarnation of Killer Frost appears as a boss in Young Justice: Legacy, voiced by Vanessa Marshall.
*The Caitlin Snow incarnation appears in DC Legends and DC Worlds Collide
Category:The Flash characters
Category:Arrowverse characters
Category:The CW characters
Category:Scientists
Category:Science fantasy characters
Category:Dark fantasy characters
Category:Antagonists
Category:Reformed characters
Category:Justice League characters