Thawing Hearts.Harley, Clayface, Psycho, and King Shark successfully use Firefly's flamethrower to storm Mr. Freeze's lair, only to get captured. Freeze explains his many failed attempts to save his ailing, frozen wife Nora Fries before trying to use Harley as a human lab rat, but she convinces Freeze to let her call Ivy who she's certain can find a cure for her illness. While they wait, Freeze invites them to lunch and relates his history with Nora. Due to her experience with Joker however, Harley believes he is lying and that Nora is his prisoner, so she uses Freeze's gun to save her, only to learn she really is dying...