Superman unmasks Batman during a confrontation in a nightclub by using his x-ray vision to peek beneath the mask, But during the confrontation, Batman slipped a small tracker on Superman and followed him back to his apartment and saw he is Clark Kent.
Example of:
The Unmasking
Superman unmasks Batman during a confrontation in a nightclub by using his x-ray vision to peek beneath the mask, But during the confrontation, Batman slipped a small tracker on Superman and followed him back to his apartment and saw he is Clark Kent.
