The synopsis for episode 20 of “Gotham” season 3 was just revealed, and you can read it below (as usual, beware of spoilers!):

TICK TOCK, THE VIRUS IS ON THE CLOCK ON AN ALL-NEW “GOTHAM” MONDAY MAY 29, ON FOX

Jada Pinkett Smith Returns as Fish Mooney

Gordon races against the clock to save the city from the Alice Tetch virus, when Lee Thompkins (Morena Baccarin) intercepts with a plan of her own. Also, Alfred sees a big change in Bruce Wayne after his work with The Shaman (guest star Raymond J. Barry). Meanwhile, some of Gotham’s most deranged villains band together in the all-new “Heroes Rise: Pretty Hate Machine” episode of GOTHAM airing Monday, May 29 (8:00-9:01 PM ET/PT) on FOX. (GTH-320) (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 Nathaniel Barnes/The Executioner, Benedict Samuel as Mad Hatter

Guest Cast: Jada Pinkett Smith as Fish Mooney, Raymond J. Barry as Temple Shaman, BD Wong as Hugo Strange

Source: TheFutonCritic.com