Batman: Dark Heart

With the discovery of a bloody heart possessing abnormal symbiotic properties, the Batfamily comes face-to-face with evil incarnate. The Dark Heart's origin is shaded in mystery, but its interest brings about the resurrection of Nightwing/Dick Grayson's worse nightmare along with a rogue of villains all bent on their own sadistic mechanications. (Seq. to NW: Ret. of a Legend).