Overview
"Hog Day Afternoon" is the sixth episode of the fourth season and 72nd episode overall from the Fox series Gotham. The show is itself based on the characters created by DC Comics set in the Batman mythology. The episode was written by Kim Newton and directed by Mark Tonderai. It was first broadcast on October 26, 2017.
The episode revolves around Gordon and Bullock tracing to a serial killer who has been targeting corrupt police officers. The killer, also known as "Professor", has been targeting the officers and put pig masks on their heads. Gordon confronts the killer and discovers more information regarding Bullock. Meanwhile, Nygma uses Butch for personal gain in the fight club to win money. He also tries to get Lee to help him deal with his problems but he also finds more about her. Also, Cobblepot begins following Sofia as it seems she's hiding something. The episode also marks the live-action debut of Professor Pyg.
The episode received positive reviews from critics, who praised Michael Cerveris' performance as Professor Pyg as well as Nygma's storyline, but Cobblepot's subplot received criticism.
Plot
At the fight club, Nygma (Cory Michael Smith) talks with Lee (Morena Baccarin) for help in order to fix his identity crisis but she angrily refuses to help him following his previous actions. Cobblepot (Robin Lord Taylor) and Sofia (Crystal Reed) meet in order to fully acknowledge each other's partnership. In another part of the city, a police officer investigates a gunshot. While searching the area, he is butchered by a man wearing a pig mask.
From Wikipedia (CC BY-SA 4.0).