Mr. Freeze
Mr. Freeze appears the episode "The Deep Freeze". Unlike his appearance in the show's opening credits, Mr. Freeze is shown without the helmet that goes with his freeze suit. He and his henchman Professor Frost plot to steal the N-1000 (a superfast submarine) to pull off the "Crime of the Century". When Batman and Robin raid his hideout, Mr. Freeze manages to freeze both of them and takes Robin with him as he escapes. When Freeze and Professor Frost steal the N-1000, they steer it to the North Pole. When Batman, Robin and Bat-Mite face Mr. Freeze and Professor Frost at the North Pole, Batman and Robin fire a beam that reverses the polarity of Freeze's freeze gun so that it warms up. They then apprehend Freeze and Professor Frost where they are both placed into prison.