Mr. Freeze and Batgirl in “Unfinished Business”

Mr. Freeze

The accident that created me finally took its toll. By the time these doctors stopped my deterioration, all that was left undamaged was this.

Batgirl

That's what you meant when you said it was too late for you.

Mr. Freeze

Ironic, isn't it? After all I did to keep my wife whole, I end up like this. You understand now why I could not return to my Nora, my treasure. There's no hope for me - or you, or your city. Everyone's going to feel my loss.