Injustice: Ground Zero — DC Comics
Issue: #23
Harley helps Superman to take down Doomsday and then it's the battle this has all been leading up to--Superman versus Superman!
Creators: Tom Derenick, Andrew Dalhouse, Rob Levin, Wes Abbott, Christopher Sebela, Matthew Clark, Jim Chadwick, J. Nanjan
Characters: Superman, Harley Quinn, Hal Jordan, Aquaman, Barry Allen, Cyborg, Hawkgirl, Wonder Woman, Green Arrow, Black Adam, Sinestro, Larry, Killer Frost (Lincoln), Jerry, Perry, Terry, Solomon Grundy, Doomsday, Barry