Nyx has been trying to save her siblings from the genetic curse of their demonic and human sides -a curse that could cause their utter destruction! But now a crisis looms as her brother, Unison, comes into his cosmic powers and threatens to consume all of reality! Nyx must team up with her partners from the swinging '70s - the Vampirella and Pantha of that far-out era - to stop the end of everything. But if it comes down to it, can she kill her own brother? She'll have to if she's going to save the universe itself!