Two HQ stills from the twentieth episode of “Gotham”, “Under the Knife”, were added to the gallery. Click the thumbnails below to view them:

And here is the official description of the episode, thanks to ComicBookMovie.com:

THE HUNT FOR THE OGRE CONTINUES ON AN ALL-NEW “GOTHAM” MONDAY, APRIL 20, ON FOX

Gordon and Bullock continue to investigate the Ogre (guest star Milo Ventimiglia), who begins to make his move on someone close to Gordon. Meanwhile, Bruce and Selina team up to expose a corrupt Wayne Enterprises employee and Nygma comes to Kristin Kringle’s defense in the all-new “Under the Knife” episode of GOTHAM airing Monday, April 20 (8:00-9:00 ET/PT) on FOX. (GTH-120) (TV-14 D, L, 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: Morena Baccarin as Dr. Leslie Thompkins, Milo Ventimiglia as Jason Lennon, Drew Powell as Butch Gilzean, David Zayas as Don Maroni, Chelsea Spack as Kristin Kringle, Carol Kane as Gertrud Kapelput, Clark Carmichael as Connor, Laurence Mason as Det. Ben Mueller, Zachary Spicer as Tom Dougherty, Michael McCormick as Doctor Darren Cushman, Daniel Davis as Jacob Skolimski, Michael Potts as Sid Bunderslaw