AboutLen Snart used a miniature stolen cyclotron as a gun which shot ice that reduced temperatures to absolute zero. Most of his crimes were in attempt to win the heart of a lady. Often he would team up with Heat Wave or his sister, Golden Glider.
Cold escaped from prison when he learned that the Picture News was planning to raise $100,000 at a charity event, which he planned to steal. However, Trickster had done the same thing. At first competing for the money, they decided to join forces when they were pursued but not only one, but two Flashes, as Jay Garrick had briefly come out of retirement. The pair successfully made their getaway, but were later captured when the two speedsters lured them into a trap by claiming that a recently discovered meteorite contained a fortune in diamonds.
After Captain Cold was released from prison, his fellow Rogues held a party for him, which turned into a riot.
Cold supposedly reformed from his criminal ways, even making a guest appearance on the Guliermo show announcing his new way of life. With his sister, Golden Glider, Snart, established Golden Snowball Recoveries, 1-800-GET-COLD, a company which recovers lost or stolen items or your money back.
They were hired by the city council of Swainsville, New Mexico, to find the Porcupine Man and his victims. They battled with the Porcupine Man, who turned out to be Wally West, but he got away from them. Three boys had been trapped in a nearby cave, and were have thought to have been the victims of the Porcupine Man. They weren't, and it was even Wally who saved them. He split the reward money with Golden Snowball.
During this time, he flew to Los Angeles and killed former prison-mate Brad Brickley, resulting in a murder investigation that remained unsolved, eventually becoming a project to challenge cadets at the LA Police Academy. It was finally solved five years later by Bart Allen.
Inertia reunited Cold and the rest of the Rogues, claiming that he could build a device that could stop time, allowing them to do whatever they wanted. However, the machine's actual use was to transfer the Speed Force from the new Flash to himself. When the Flash arrived to stop them, the machine rendered him powerless. However, the Rogues soon realized that someone was helping the speedster, and it was possible that his powers could be returned. Not wanting this to happen, Cold, along with Heat Wave and Weather Wizard, fired on the powerless Flash in the back, resulting in his death.
After being hunted remorselessly by heroes, and a year of chaos and trouble, including deportation to the Hell Planet during the events of Salvation Run, the Rogues' decided to quit the business, but not before they strike back against Inertia during the events of Final Crisis: Rogues' Revenge.
Captain Cold, along with the rest of the Rogues, has met with constant trouble from Libra and his new Secret Society of Super-Villains, attempting to press gang them into their ranks as a safety precaution against Speedsters. Cold, however, angrily rejected Libra's invitation, saying that the villain community had done nothing to help the Rogues following Bart's murder. As of yet, Cold and the Rogues have completely outright refused membership, despite numerous threats made to their families. The New Rogues were sent to enlist them by holding Captain Cold's father hostage, but after Cold had the rest of the Rogues slaughter the new group, he had Heat Wave murder his father.
Following the murders of the New Rogues, Cold and the other Rogues resumed their plan to kill Inertia. However, they had trouble from Inertia's new mentor, Zoom. They were also still stalked by Libra, who had Weather Wizard's infant son. Inertia killed the boy and took on the mantle of "Kid Zoom", vowing to cause a lot of tragedy. Paying him back for all the trouble he had caused them, the Rogues broke their unspoken pact against killing speedsters for a second time. Pleased, Libra revealed why he so desperately wanted the Rogues in the Secret Society: Barry Allen had returned from the dead, and the Rogues were the only ones who knew him well enough to stop him and allow evil to triumph. Though shocked at the news of Barry's return, Cold still rejected Libra's request for membership, saying he didn't believe in evil. Inertia's body was left in front of the Keystone City Police Department, next to the written words "Tell the Flash we're even - The Rogues". Following these events, Cold announced that he wasn't going to retire, both to not appear as quitters to Barry Allen, and because he knew that Barry wouldn't just let them walk away.
Leonard Snart does not possess any known superhuman powers/capabilities.
As Captain Cold, Start's nervous system has, over the years, developed reflexes that enable him to compensate for the Flash's speed enough to sometimes stun the Flash with his cold guns. In addition, Leonard Snart is a very skilled marksman, though not on the same level as people like Deadshot and Deathstroke. He also has a very tactical mind, and his own personal sense of honor. He is a natural leader.
Captain Cold has demonstrated strength enough to lift over his head and throw another fully grown human male (Chillblaine). This would indicate that Cold possesses at least the strength of a man of his age, height, and build who engages in moderate regular weight bearing exercise.
Captain Cold possesses all of the same weaknesses as any other adult non-metahuman male.
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The Man Who Mastered Absolute Zero