Before she was selling her soul to make bigger icicles, Killer Frost briefly enlisted in the Suicide Squad. Joining up with other villains to complete missions in exchange for a reduced sentence, Killer Frost has been known to occasionally put her powers to positive use. In this capacity, she featured prominently in the animated film Batman: Assault On Arkham, where she helped break into Arkham Asylum and entertained a flirtatious relationship with King Shark. Rumours have her pegged to briefly cameo in the upcoming Suicide Squad movie as well, and given her pedigree, it seems like a safe bet that she might. With the Suicide Squad a big part of The Flashs universe, that could be a place for this Earth-2 Caitlin to be stowed away. As an audience, it would let us have our cake and eat it too, letting us see this villainous side to her without having to give up the regular version for good.