(JLA #59) - Joker Jokerized a number of inmates at the Slab, including Killer Frost. The insane Frost was captured, given an antidote to the Joker Venom, and put in a metahuman holding facility in Death Valley.

(Superman / Batman #3) - Frost and a number of other supervillains attempted to collect the billion dollar bounty President Luthor placed on Superman’s head but failed.

(Superman Secret Files and Origins 2004) - Maxwell Lord, impersonating Sarge Steel, hired Killer Frost, Captain Boomerang, Double Down, and King Shark to break into Belle Reve prison and kill Amanda Waller. The villains were defeated by Superman.

(Firestorm II #8,-10) -Killer Frost’s body started deteriorating, forming ice crystals in her joints. After the original Firestorm died a new one appeared on the scene, her physician Dr. Franks suggested he could help her. She was frustrated that he’d been unable to help her before, and froze Franks to death. Killer Frost decided to trick Firestorm into restoring her powers. She posed as Laura, a suicidal woman with cancer, and begged him to cure her. He resisted, but she pleaded, and he decided to give it a shot, taking a copy of a healthy human matrix and transferring it to her. He was starting to develop a crush on her, but when he unleashed his energy on her she revealed her true identity. The original Firestorm’s ally assisted the new hero in battling her, but her powers had been amped up, and she fought them to a standstill. She looked forward to killing the heroes, but told Firestorm she might let him live if he let her leech his energy anytime she wanted. Frost took a number of hostages, and made Firestorm submit to her, but when he asked what she wanted she told him she just wanted to see him cave in, and killed the hostages. Frost wanted to kill him so he didn’t undue blessing her with his power, and he was forced to merge with Firehawk to upgrade his own power. This awoke a tiny part of the original Firestorm Ron Raymond that was still alive in the matrix, and the three of them attacked Frost as Firestorm, with Ronnie leading the show, dismissing Jason and reminding him who the original hero was. Three people in the Firestorm-Matrix started to burn Firestorm out, and Ronnie began to disintegrate. Jason took over, and undid the cellular repair he did on Frost, but Ronnie disintegrated into nothing, and the matrix broke. Frost was outraged, and her body was in an even more damaged state that when she was rejuvenated, so she attacked Jason with an ice club, but the arrival of the police forced her to flee. Jason was taken to the hospital, where he realized Raymond was still communicating with him.

(Firestorm II #11) - In her debilitated state Frost followed Firestorm to the hospital, and overheard the two minds that made up the Firestorm-Matrix talking to each other. She couldn’t directly go after them, but going through underworld information specialist Calculator, she sold the information that the original Firestorm was alive to his old arch-nemesis Cliff Carmichael.

(Villains United #2) - Frost joined “Lex Luthor’s” Society. Luthor wanted to destroy the Secret Six III, a group of dissident villains that refused to join the Society, so he sent Frost and a number of other Society members to confront the Six aboard the Petrovia, a Russia cargo freighter carrying Thanagarian weapons destined for the Society. The Society defeated the Secret Six and brought them back to Lex Luthor.