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Episode Title: Batman & Mr. Freeze: SubZero.
Episode Description: Since his last encounter against Batman, Mr. Freeze has found a home in the Arctic and started a family (of sorts) with the still cryogenically-encased Nora, an Inuit boy named Kunac, and two pet polar bears, Hotchka and Shaka. Nora's condition begins to rapidly deteriorate due to a submarine accidentally emerging from underwater directly underneath them, shattering her containment vessel. Freeze returns to Gotham City with his companions. He enlists the help of Dr. Gregory Belson to find a cure. Belson determines that Nora needs an organ transplant, but due to her rare blood type there are no suitable donors available.
Freeze declares that they will use a live donor, even if it means the donor will die in the process. Belson is at first reluctant to kill an innocent girl, but Freeze bribes him with a gold nugget and even more gold from an entire vein in the Arctic that will put an end to Belson's financial problems. Barbara Gordon (Batgirl) is a perfect match, and Freeze learns from her roommate that she is at a restaurant with her boyfriend, Dick Grayson (Robin). Freeze attacks the restaurant and kidnaps Barbara, taking her to an abandoned oil rig where he and Belson are hiding. Freeze and Belson explain the situation to Barbara, who claims that she is willing to help Nora for the "blood transfusion", but not at the oil rig, prompting Freeze to keep Barbara imprisoned. When the time for the operation comes, Barbara realizes that they are lying when they say she will need to be put under for a mere transfusion. She escapes with the help of Kunac. Belson gives pursuit and almost catches her, before the arrival of Batman and Robin...