The promo features Oswald Cobblepot (Robin Taylor) revealing his true identity to Maroni (David Zayas), who is riding high after winning part of the bid to take over Arkham Asylum, and now threatens to take over the city's criminal underworld. Unfortunately for Oswald, Maroni doesn't take the news of his former ties to Fish Mooney (Jada Pinkett Smith) quite well. Maroni is also seen threatening the lives of both Oswald and Jim Gordon (Ben McKenzie), while we also get a new look at Selina Kyle (Camren Bicondova) and Edward Nygma (Cory Michael Smith).
What remains unclear is what the episode's title, "Viper", really means. The official synopsis for next week's episode reveals that Gordon and Bullock (Donal Logue) are, "on the hunt for the source of a new street drug that causes euphoria then death." Could this drug be named Viper? Or is Viper a new villain that will emerge? Check out the latest footage then find out for yourself when "Viper" airs next week.