While still a young child, Rebecca fell deathly ill from a mysterious disease. Batman tried to help the Langstroms, but when he came into possession of the Seronotal needed to save her life, the Batman destroyed it, believing the formula had been tainted.
Rebecca was eventually saved, due in no small part to the efforts of Superman, but Kirk felt that Batman had betrayed them and had tried to kill his daughter. His hatred of Batman grew into an obsession and this obsession began to affect his work. In short order, the Langstroms lost their home and their fortune. They were forced to return to Gotham City where they lived in a rundown apartment in Gotham’s East End.