Superman assists S.T.A.R. Labs in thawing out Killer Frost despite warnings from Professor Martin Stein. When she's freed, Killer Frost freezes the lab techs and puts Superman under her control. Witnessing her escape, Professor Stein becomes upset, causing Ronald Raymond to turn into Firestorm. Realizing what has occured, Firestorm must stop Killer Frost from enacting her plans while also fighting the Man of Steel.