Batman & Mr. Freeze: SubZero

Since his last encounter against Batman, Mr. Freeze has found himself a home in the Arctic and started a surrogate family with his still cryogenically-encased wife Nora, his newly adopted Inuit son Koonak, and a pair of pet polar bears, Notchka and Shaka. Then one day, a submarine emerges from underwater through the floor of their cave-turned-home, shattering Nora's containment vessel, after which her condition begins rapidly deteriorating. After punishing the submarine crew, innocently unaware of their mistake, by freezing them with his trusted freeze gun, Freeze returns to Gotham City with his companions to enlist his old colleague Dr. Gregory Belson to help find a cure. Belson determines that Nora needs an organ transplant, but due to her rare blood type there are no suitable donors available to them. Freeze declares they will use a live donor, even if it means killing an innocent person, and bribes Belson into compliance with a promise of gold that will put an end to Belson's own financial problems.