Legends of the Dark Knight — DC Comics
Issue: #4
"Crisis in Identity" part 1! The Joker has a nefarious plan that involves brainwashing the wealthy and elite of Gotham City and convincing them they're Batman--to murderous effect!
Creators: Ben Abernathy, Kristy Quinn, Saida Temofonte, Saida Temofonte, Ben Templesmith, B. Clay Moore
Characters: Batman, Joker, Harvey Bullock, Killer Croc, James Gordon