Gotham: Knock, Knock

"Knock Knock" is the second episode of season two of the crime drama series Gotham, and the twenty-third episode of the series overall. This season is billed under the subheading of "Rise of the Villains". The episode was directed by Danny Cannon with a script written by Bruno Heller. It first aired on the FOX Network on Monday, September 28th, 2015.