Revenge is the key here, with a flashback to a Mr. Freeze origin story. The wealthy industrialist whose company he worked for interfered with an experiment, causing it to go disastrously wrong, killing a scientist's wife and forever altering him to need cold temperatures to survive. Mr. Freeze comes into being.
Now Mr. Freeze is out for revenge against his former boss, and he doesn't care who he hurts in his lust to provide a similar fatal fate to the industrialist that his wife suffered.
Who can blame him? If someone did that to MY wife, I'd be out to take MY revenge, too. Unfortunately, Batman can't let innocent lives be lost, or even that of the guilty taken. And so the battle of wits begins ...
Now Mr. Freeze is out for revenge against his former boss, and he doesn't care who he hurts in his lust to provide a similar fatal fate to the industrialist that his wife suffered.
Who can blame him? If someone did that to MY wife, I'd be out to take MY revenge, too. Unfortunately, Batman can't let innocent lives be lost, or even that of the guilty taken. And so the battle of wits begins ...