Batman & Mr. Freeze: SubZero is a 1998 American animated superhero film, the second film based on Batman: The Animated Series, taking place between the end of the show and the start of The New Batman Adventures. Kevin Conroy and Michael Ansara reprise their respective roles from the series as the two title characters while Mary Kay Bergman replaces Melissa Gilbert as the voice of Batgirl. It was produced by Warner Bros. Animation as a marketing tie-in with Batman & Robin and was animated overseas by Koko Enterprises and Dong Yang Animation in South Korea. The film received positive reviews from critics and won the Annie Award for Best Home Video Animation.

Plot

Since his last encounter against Batman, Victor Fries has made a home for himself in an Arctic cave with a newly adopted Inuit son, Koonak, and polar bears Notchka and Shaka. His wife, Nora, remains in her cryogenic chamber while he seeks a cure for her illness. A research submarine surfaces through the frozen floor of the cave, shattering Nora's containment vessel and causing her to rapidly deteriorate. Fries freezes the submarine crew and returns to Gotham City, enlisting his old colleague Dr. Gregory Belson to help find a cure.