In "Unleashed," there's a new villain on the loose, and Penguin is none too happy about it. The May 9th episode of "Gotham" finds Oswald out for revenge as Azrael runs amok in Gotham and Professor Strange evades arrest. Michelle Veintimilla will also return to reprise her role as the villain Firefly.

According to the official episode description,

Azrael is on the loose in Gotham City, which sparks Penguin's need for revenge. Meanwhile, Bruce enlists the help of Selina Kyle to help track down Professor Strange, as he evades arrest for his experiments. "Wrath of the Villains: Unleashed" episode of Gotham will air Monday, May 9 (8:00-9:00 PM ET/PT) on FOX.

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Starring Ben McKenzie, Donal Logue and David Mazouz, "Gotham" airs Mondays at 8 pm EST on Fox.