Gotham City Impostors is all about obsessive fans. Obsessive fans who, as is so often the case, happen to be both slightly unstable and very heavily armed.
It's a multiplayer-only online shooter set in the Batman universe - but because Batman doesn't actually like to shoot people in his universe, Monolith, the game's developer, has had to get creative. The solution it's come up with is to offer players the choice between two opposing teams of cut-price vigilantes decked out in cheap costumes and weighed down with home-made gadgets and weapons.
Drawing inspiration from the real superheroes and villains, these gangs have called themselves the Bats and the Jokerz, and they spend their weekends blasting each other to pieces. This, in case you haven't noticed, is the set-up for one of the weirdest licensed games you'll have seen in quite a while.