This week Gordon will be faced with a deadly drug problem in the city. Get a look with the stills and synopsis of Gotham season 1, episode 5, “Viper.”

Moony will continue with her plan to take down Falcone and train her new weapon this week on Gotham. Maroni has some plans of his own as Oswald works his way closer to the mob boss. Becoming the restaurant manager allows him to follow Maroni’s deals more closely.

But Maroni isn’t one to be fooled and quickly learns something is up. So he decides to test Oswald’s loyalty. And Maroni’s investigation into the truth will cause him to go after Gordon.

Gordon and Bullock will also have to race to stop an act of terrorism in the city. While Bruce and Alfred’s lives come into danger. Plus Selina Kyle will make a return.

The synopsis for Gotham season 1, episode 5, “Viper,” is:

“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 her plot against Falcone in the all-new “Viper” episode of GOTHAM airing Monday, Oct. 20 (8:00-9:00 PM ET/PT) on FOX.”

Guest cast includes: 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

Take a look at the episode stills below:

Watch the promo for the episode below:

‘Gotham’ season 1, episode 5, ‘Viper’ airs Monday Oct 20 at 8 p.m. ET on Fox!