Earth 2: Dinah Lance had it all, the full fledged DA of Gotham, a beautiful wife, wonderful friends, awesome dads and a night time gig as a vigilante known as Black Siren. That is until Julian Slink, Damian Darhk and Rumplestiltskin put together a devious plan. They summoned a demon that possessed Dinah but unknown to them Father Tomas Keane and Father Marcus Keane, priests and husbands, were good friends of hers and started the Exorcism quickly. But to fully save her they will have to call in help from Earth 1 and Earth 37. Can they save Dinah and get rid of Damien, Slink and Rumple for good?