GCPD Officer Denning

GCPD Officer Denning was an undercover Officer within Arkham City.

Batman: Arkham City
When Arkham City was developed, Commissioner James Gordon, due to his attempts to question Sharp about Arkham City either being ignored directly or placed in red tape, sent ten members of the 13th precinct to go undercover into Arkham City, one of them being Denning.

Unfortunately, as soon as he and his fellow squad arrived in Arkham City, they were exposed via an information leak and captured by the Penguin's men. He was taken alongside Southwold  to the Iceberg Lounge to be tortured by the Penguin himself. When Batman arrived to rescue the unit as well as retrieve Mr. Freeze, after saving the surviving members of the team, the Penguin began broadcasting to Batman for "entertainment" as he was crossing the thawing ice separating the four areas of the hideout. He asked for Dennings name, only to Dennings to tell Penguin "Yeah? screw you!" Realizing that Dennings still has some life in him, he decided to make Dennings (whom he referred to as "piggy") "squeal" by freezing his fingers with Mr. Freeze's Ice Gun and preparing to hit the frozen fingers with a hammer. He along with Southwold are eventually rescued by Batman after he managed to retrieve a security protocol to deactivate the Ice Gun.