Grundy was trapped under the Iceberg Lounge and was used by the Penguin as an emergency against Batman. However, Batman overpowered and defeated him. Grundy encountered Batman underneath the Gotham City Sewers and started chasing the Dark Knight. However, Penguin unleashed Grundy who had inhuman strength and almost killed Bane, forcing Bane to retreat. Grundy remained imprisoned underneath the Lounge until Bane, disguised as a street thug, infiltrated The Iceberg Lounge and demanded Penguin give him TITAN he had stored away. Batman ended the fight by knocking Grundy into the door, which caused it to break open. Grundy escaped, ran toward Batman, and forced the Dark Knight to slow him down by activating nearby fuse boxes with his Explosive Gel Launcher. Under Blackgate Prison, Batman found a locked door with Solomon Grundy behind it. He remained there until Penguin found him when he bought the nightclub. Grundy was then brought to a place where the Iceberg Lounge was built. Known as Solomon Grundy, he went on a rampage in Wonder City, before being killed again by the Wonder City Guardians. After being murdered so many times, Gold forgot who he was and what he did, and only remembered an old nursery rhyme, after which he named himself. Gold ended up in a cruel cycle of being killed and then brought back to life. He was somehow killed and he was then found by Ra's al Ghul, who used him to experiment on, in order to perfect his Lazarus Pit.

Cyrus Gold was a murderer who sought refuge in Slaughter Swamp.

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