A few years ago, an incident occured in a nuclear power plant. Apparently someone sabotaged the reactor core in a way that would cause a meltdown in the entire facility, resulting in a nuclear explosion with a radius of 20 miles. Most of the people exposed to the fallout died of radiation poisoning, but those who survived were mutated in one way or another, 2 of those people being Hot Head and Jack Frost. Those people called themselves "The Elementals" and swore to use their powers for the greater good (although someone didn't entirely agree to that, you can guess who it was). The saboteur's wereabouts are currently unknown since the authorities never found traces of them in the explosion site, so they're either missing or so dead they turned into unrecognizeable ash.