When Jerome was little, Zachary put his nephew's hand in a pot of boiling chicken stock because Jerome tried to steal a snickerdoodle.
Years later, Jerome pays his uncle a visit at his diner after his breakout from Arkham Asylum. When Police appear, Zachary is forced to cover for his nephew after the latter threatened him. Afterwards, Jerome is revealed to have been hiding under the table before talking to his uncle. Zachary soon revealed that he prepared three different soups where one was for himself, one was for Jerome, and one was for Lunkhead who showed up to help. Zachary states that he was aware of Jerome coming after him, so he had help and proceeds to torture his nephew before voicing plans to kill him for what he did to his sister. When Bruce Wayne showed up to confront Jerome, Zachary tried to have him leave but the latter was insistent on having them call the cops. Realizing he won't leave, he had Lunkhead attacked as Jerome tried to get Zachary to ingest bleach. Though Zachary got out of it by writing down the address for St. Ignatius, Jerome still killed him by shooting him. Zachary's written address would later be used by Bruce when he calls up Jim Gordon.
- "Ace Chemicals" (indirectly mentioned)