The Joker knows Dick Grayson is Nightwing-and the plans The Joker has set in motion in this summer's event "Joker War" will haunt Batman forever. Under the control of The Joker's new henchperson, Punchline, Nightwing must battle the people he once loved most: Batgirl, the Robins, and... himself. FINAL COVER MAY VARY. ALLOCATIONS MAY OCCUR.