Victor Fries (Earth-4678)

"You will bring me Nora... or you will die!"

- Mister Freeze, to Batman

Victor Fries, also known by the media as Mister Freeze, was a brilliant cryogenicist and former GothCorp employee whose beloved wife, Nora, was stricken with a fatal degenerative disease. Fries placed Nora in suspended animation while he obsessively searched for a way to cure her, but the corporation that funded his research - and Nora's life - pulled the plug, and triggered an accident that transformed Fries' body into a cold-blooded form that must always be kept at absolute zero. At normal room temperature, he would die.

Source

 * https://arkhamcity.fandom.com/wiki/Mr._Freeze