The Season 3 finale of Gotham hinted at some big changes Butch Gilzean, the mercurial mob enforcer who, even while clinging to life in the hospital, was still capable of surprising viewers: His medical chart revealed his real name to be Cyrus Gold, better known to longtime DC Comics readers as super-strong zombie Solomon Grundy.

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Although Butch (Drew Powell) won't be seen in the Season 4 premiere, Gotham's producers won't keep him on ice for long. And they're eager to reveal just how Butch transforms into Solomon Grundy.

“He’s been in a vegetative state at Gotham General," executive producer John Stephens told Entertainment Weekly, "and so in order to clear up space for more beds, the administrators at the hospital have him dumped in Slaughter Swamp, as one does in Gotham. So he emerges reborn out of Slaughter Swamp as the character we know as Solomon Grundy.”

Not only that, but Stephens revealed that Grundy's first interaction in his new form will be with Edward Nygma, better known as the Riddler. “We begin the story of a very unlikely friendship between these two who are sworn enemies but now, all of a sudden in Season 4, are best friends as they move through Gotham," Stephens teased.

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When Marina Benedict was announced to be joining Gotham, we also found out that her character will indeed work with, and possibly against, Solomon Grundy -- as well as Nygma, and other iconic villains. Benedict will play Cherry, the owner of a fight club in Gotham’s most lethal neighborhood, The Narrows.

Returning Thursday, Sept. 21, on Fox, Gotham stars Ben McKenzie as James Gordon, Donal Logue as Harvey Bullock, David Mazouz as Bruce Wayne, Robin Lord Taylor as Penguin, Cameron Bicondova as Selina Kyle, Erin Richards as Barbara Kean and Sean Pertwee as Alfred Pennyworth.