The synopsis for episode 17 of “Gotham” season 3 was released, and you can read it below (beware of spoilers!):

GOTHAM’S MOST UNHINGED VILLAINS UNITE ON AN ALL-NEW “GOTHAM” MONDAY, MAY 8, ON FOX

Mr. Freeze (Guest Star Nathan Darrow) and Firefly (Guest Star Camila Perez) Return

Some of Gotham’s most unhinged villains band together, while The Riddler continues his conquest of the city. Gordon is on a search for answers and all roads keep leading him back to the Court of Owls. Meanwhile, as Alfred begins to notice a change in Bruce, Bruce 2 confides in Selina (Camren Bicondova) in the all-new “Heroes Rise: The Primal Riddle” episode of GOTHAM airing Monday, May 8 (8:00-9:01 PM ET/PT) on FOX. (GTH-317) (TV-14 L, V)

Cast: Ben McKenzie as Detective James Gordon, Donal Logue as Harvey Bullock, David Mazouz as Bruce Wayne, Morena Baccarin as Leslie Thompkins, Sean Pertwee as Alfred, Robin Lord Taylor as Oswald Cobblepot/The Penguin, Erin Richards as Barbara Kean, Camren Bicondova as Selina Kyle/the future Catwoman, Cory Michael Smith as Edward Nygma/the future Riddler, Jessica Lucas as Tabitha Galavan, Chris Chalk as Lucius Fox, Drew Powell as Butch Gilzean, Maggie Geha as the future Poison Ivy, Michael Chiklis as Detective Nathaniel Barnes, Benedict Samuel as Mad Hatter

Guest Cast: Richard Kind as Aubrey James, Leslie Hendrix as Kathryn, Camila Perez as Firefly, Nathan Darrow as Victor Fries/Mr. Freeze

Source: TheFutonCritic.com