Mannheim came out of hiding to meet with his lieutenant Whisper A'Daire for a new plan. Outside the Hall of Justice, he used an Apokoliptan device to revive and merge the dormant Appellaxian husks inside the museum. He brought the golem under his control, and hoped that it could act as Intergang's enforcer. Despite the intervention of Superboy, Blue Beetle, the New Genesphere and Wolf, Mannheim and A'Daire absconded with the golem.
The New Genesphere blocked the signal of Mannheim's device and destroyed it. This shattered Mannheim's control over the creature, and the Golem swatted and Whisper away. Blue Beetle restrained them both with a staple gun.
Sportsmaster visited them while they were pinned down, and gave them a powerful sedative that renders its subjects catatonic for weeks. Later, Superboy found them still bound, and non-responsive.
Background in other media
Bruno "Ugly" Mannheim was the leader of Intergang and the Religion of Crime. He took over after the death of his father, Boss Moxie.
This is Mannheim's second animated appearance. He was a major villain in the first two seasons of Superman: The Animated Series, as leader of Intergang and stooge of Darkseid. He was killed in the season 2 finale.