A NEW STREET DRUG STORMS THE STREETS OF GOTHAM ON AN ALL-NEW "GOTHAM" MONDAY, OCTOBER 20, ON FOX

Gordon and Bullock search for the source of a new street drug that causes euphoria then death. Meanwhile, Oswald Cobblepot works his way deeper into Maroni's (guest-star David Zayas) inner circle and Fish Mooney continues to plot against Falcone in the all-new "Viper" episode of GOTHAM airing Monday, Oct. 20 (8:00-9:00 PM ET/PT) on FOX. (GTH-105) (TV-14 D, L, S, V)

Cast: Ben McKenzie as Detective James Gordon, Donal Logue as Harvey Bullock, Jada Pinkett Smith as Fish Mooney, Sean Pertwee as Alfred, Robin Lord Taylor as Oswald Cobblepot/The Penguin, Erin Richards as Barbara Kean, David Mazouz as Bruce Wayne, Camren Bicondova as Selina Kyle/the future Catwoman, Zabryna Guevara as Captain Sarah Essen, Cory Michael Smith as Edward Nygma/the future Riddler, Victoria Cartagena as Renee Montoya, Andrew Stewart Jones as Crispus Allen, John Doman as Carmine Falcone

Guest Cast: Daniel London as Stan Potolsky; Kett Turton as Busker; Genevieve Hudson-Price as Charmagne; Peter Maloney as Isaac Steiner; Margaret Colin as Taylor Reece; David Zayas as Maroni; Jeremy Davidson as Nikolai; Danny Mastrogiorgio as Frankie Carbone; Mackenzie Leigh as Liza.