The Batman tie-in tales to the epic ZERO HOUR storyline are now finally collected into one graphic novel in BATMAN: ZERO HOUR! Time is collapsing upon itself! The villainous Extant has ushered in a series of black holes that are swallowing the universe, past, present and future! The Bat-family, like everyone else in the DC Universe, has seen time loops affect their lives. The result? The return of Barbara Gordon, Batgirl! The Dark Knight stories tying into the classic ZERO HOUR event are now available in their entirety. Collects BATMAN #0, #511, BATMAN: SHADOW OF THE BAT #0, #31, DETECTIVE COMICS #0, #678, CATWOMAN #0, #74, BATMAN: LEGENDS OF THE DARK KNIGHT #0 and ROBIN #0, #10.