Bearing more than a passing resemblance to Frankenstein's Monster, Jerome Valeska delivers a message in the new promo for Monday's midseason premiere of "Gotham." Mind you, considering that Cameron Monaghan's proto-Joker character supposedly died in Season Two of the Fox drama, probably looks about as good as can be expected.

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"Gotham has no heroes," he says, "nothing but darkness. I would like to share that with you."

The changes to the returned Jerome aren't merely cosmetic, however. "It's the same Jerome, but altered," executive producer John Stephens explained to TV Guide. "He's not as nice as he was before. Someone who has basically gone through death and come back to life has a very different point of view. He also has a grander point of view. It's altered how he is. It's odd to say he's more psychotic than he was before."

Jerome's three-episode arc, which begins with Monday's "Ghosts," will entangle David Mazouz's young Bruce Wayne, whom Stephens said "takes a big step" toward becoming Batman. "Jerome being the stand-in for the person we know he probably is out there, it's, for us, really significant that that guy ends up informing this part of Batman's mythology," he teased.

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But Jerome isn't the only villain who'll return in the second half of Season Three: Fans should expect Mr. Freeze and Firefly, even as the series wades deeper into the Court of Owls.

Returning Monday at 8 p.m. ET/PT on Fox, “Gotham” stars Ben McKenzie as Detective Jim Gordon, David Mazouz as young Bruce Wayne, Sean Pertwee as Alfred Pennyworth, Camren Bicondova as young Selina Kyle, Donal Logue as Harvey Bullock, Robin Lord Taylor as Oswald Cobblepot, Cory Michael Smith as Edward Nygma, Morena Baccarin as Leslie Thompkins and Jada Pinkett Smith as Fish Mooney.