Watch Batman & Mr. Freeze: SubZero (1998) full movie online.
Synopsis: Mr. Freeze is living in the arctic with his cryogenically-frozen wife. When a submarine destroys her containment capsule, he has to find someone to “donate” a new heart for her. His search turns up one donor with the right blood type: Barbara Gordon. Her kidnapping sends Batman and Robin on a hurried chase to free her in time.
Director: Boyd Kirkland
Writers: Bob Kane, Randy Rogel
Stars: Kevin Conroy, Michael Ansara, Loren Lester
More infor: IMDB, Wikipedia