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, Notchka and Chokka. Freeze returns to Gotham City with his companions, and 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.