Gotham City Impostors was a first-person shooter multiplayer-only video game developed by Monolith Productions and published by Warner Bros. Interactive Entertainment.

In addition to guns and knives, the players could use other gadgets such as grappling hooks, glider wings, roller skates and explosives.

Lastly, there was a training mode called "Initiation", where the Bats' leader instructed the player on how to use weapons and gadgets.

Heath survived the attack, but was left paralyzed while fully conscious for years; his mouth twisted into a permanent duplicate of the Joker's own smile.

When he regained full mobility, he discovered that his girlfriend, Beth – who was exposed to the Joker venom under the same circumstances, as the two took the same drugs - was left to die in their apartment as Batman was so caught up in trying to catch the Joker that he never looked back after 'rescuing' Heath, with the result that Beth was left to get eaten alive by crows.

Downloadable content was released for all platforms and included new weapons, costumes, and three new stages: the 25th Floor, Arkham Asylum, and the East End.

[4] G4 writer Leah Jackson said of the playable demo: "Quite frankly, the game doesn't feel like your run of the mill downloadable title.