Gordon and Bullock track down a vigilante who uses weather balloons to kill corrupt citizens; Cobblepot gets a job close to a major figure in the underworld.

As a contentious city council vote on the future of the Arkham district approaches, politicians from both sides are in danger. Gordon and Bullock must race to protect the council and an old friend visits Gordon.

Gordon and Bullock search for the source of a new street drug that causes euphoria then death. Oswald Cobblepot works his way deeper into Maroni's inner circle. Fish Mooney continues to plot against Falcone.

As violence between Maroni and Falcone continues to escalate, Penguin reveals a new element of his manipulative strategy, forcing Gordon to deal with the consequences of his decision to spare Penguin’s life

Gordon’s assignment at Arkham Asylum gets off to a rocky start when the murder of a guard ignites an investigation, leading him to meet Dr. Leslie Thompkins. Cobblepot continues to build his army.

In an attempt to get his job back, Gordon seeks to capture Jack Gruber, a deranged electrical genius who escapes Arkham Asylum. Meanwhile, Falcone struggles to hold onto his empire after Fish Mooney makes her next move.

Fish Mooney reveals a secret of Oswald Cobblepot's, prompting Maroni to take him on a trip to test his loyalty. Meanwhile, Gordon and Bullock hunt down a killer who targets victims with severe phobias and Bruce Wayne confronts Gordon for failing to make progress on his parents' murder case.

Gordon and Bullock set out to stop Gerald Crane, a biology teacher who has been harvesting the glands of his murder victims. Meanwhile, after finding herself in an unusual setting, Mooney continues plotting to gain power, and Falcone attempts to change Maroni's plan for the Penguin.

Gordon and Bullock continue their investigation of the Ogre, 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.

The Ogre breaks down Barbara’s emotions, while Gordon and Bullock go to great lengths to track him down. Meanwhile, Penguin leads a massacre, beginning an epic war, while Bruce learns the truth about Wayne Enterprises and Nygma deals with his recent actions.

As Gotham City’s gang war reaches its boiling point, Fish Mooney goes head-to-head with Maroni and Penguin in an attempt to re-stake her claim on the city. Meanwhile, Barbara and Leslie Thompkins are brought together after recent events, and Bruce searches Wayne Manor for any hints that his father might have left behind.