- "Solomon Grundy. Born on Monday."
- —Butch Gilzean's first words after being revived[src]

Butch Gilzean (born Cyrus Gold) was a former criminal, and was an experienced member of the Gotham City underworld crime system. He was a former underling of Fish Mooney, but later came to be second-in-command under Oswald Cobblepot after being brainwashed by Victor Zsasz to do the latter's bidding. The Galavans later cleared him of his brainwashing and after Cobblepot was deserted and left for dead by his own men, Butch took over as the new leader of Gotham's underworld, but within a couple of months retook his position as Penguin's second-in-command. Months out of jealousy for Penguin's preference over Edward Nygma, he hired mercenaries to take on the alias of the Red Hood Gang in order to stage a rescue for Oswald and win his favor again only to be caught out by Nygma. Sent to a hospital from injuries sustained during the coup, Tabitha Galavan hijacked the ambulance and sent him into hiding. Later on, he and Tabitha began conspiring against the current ruler of Gotham, Barbara Kean, to take control of the underworld themselves. However, Butch was shot by Barbara leaving him comatose in Hospital Brass. Upon his body being dumped into Slaughter Swamp, Butch is revived as Solomon Grundy and befriends Nygma, with no knowledge that he hated him, and the two go to Cherry's place in The Narrows where they join forces with Lee Thompkins to get money. Eventually, Tabitha discovers Butch's current state and helps him regain his memory.
Oswald later has Hugo Strange captured and forces him to cure Butch's condition. Following his return to his normal state, he reunited with his lover Tabitha and they confess their love for one another but Oswald shoots and kills Butch, as part of his scheme to get revenge on Tabitha for killing his mother.
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