Injustice: Ground Zero — DC Comics
Issue: #20
Harley has her final showdown with the Joker, while Shazam confronts Superman.
Creators: Stephen Segovia, Rob Levin, Wes Abbott, Elmer Santos, Christopher Sebela, Jim Chadwick, Daniel Sampere, J. Nanjan, Juan Albarran, Miguel Mendonca
Characters: Superman, Joker, Harley Quinn, Hal Jordan, Aquaman, Barry Allen, Cyborg, Hawkgirl, Wonder Woman, Green Arrow, Raven, Billy Batson, Lex Luthor, Black Adam, Sinestro, Larry, Jerry, Perry, Terry, Gary