Originally known as Victor Fries, Mr. Freeze was a brilliant scientist with a wife named Nora. Eventually Nora fell ill and left Victor with no choice but to cryogenically freeze her until a cure could be discovered.
There was an accident, and then Victor became capable of living only in temperatures below zero. Victor donned a special cold suit, took up the name Mr. Freeze, and became an enemy of Batman. He fights using weapons that involve the cold and is virtually emotionless.