Caitlin Snow was a researcher assigned to work in the arctic outpost for S.T.A.R Labs on a machine that broke the laws of thermodynamics to create perpetual motion. Nobody expected the machine to actually work, least of all her colleagues who were being paid off by H.I.V.E to stop the machine from being completed so they could secure their interests in the energy market. However, Caitlin got the machine to work. This led her colleagues to throw her inside of it and turn it on. What they expected to happen was for Caitlin to die and them to explain it away as a lab accident. What actually happened was the machine made Caitlin essentially become a heat vampire. She gained the ability to generate ice and remove heat from other people's bodies. However, it also robbed her of her ability to generate heat, meaning she was slowly freezing to death and the only cure was to drain the heat from other people. This pushed her into becoming a murderer and a supervillain, but recently she has turned over a new leaf and joined the Justice League of America.