Adam Brewer (Earth-5192)

Adam Brewer is a former Ace Chemicals factory worker who works on the Ace Chemicals Factory. When the plant was attacked in October 31st, 2015, Brewer and his fellow employee Mark Cheung were the only survivors of a raid by the Arkham Knight, but were then saved by Batman.

Scarecrow's Revenge
Adam Brewer worked as an employee for Ace Chemicals at the Ace Chemicals Factory on Bleake Island, Gotham City. During a normal day at his job, the factory was attacked by the Crimson Militia under the command of the Arkham Knight and Scarecrow.

Together he and five other workers, including Mark Cheung, were made hostages by the militia members. However, only Adam and Cheung were spared when the mercenaries realized they knew the most about Ace's systems among the employees, as they planned on granting Scarecrow access to the fusion chamber.

Rescued
The same night, Brewer was saved by Batman after being brutally beaten by three militia members; the Dark Knight had infiltrated the factory in search of survivors and means to locate the militia's main hideout.

He took both Adam and Mark to the Batmobile, automatically setting the vehicle to take them for safety with Commissioner James Gordon and other GCPD officers who awaited outside the facility. During the rest of the night, the two of them were kept safe at the GCPD Headquarters. When the place was attacked by vengeful forces of the militia, he and Mark kept hidden in the corrections room alongside all other survivors still in the city.