"A threat of cosmic proportion to DCs newest (and oldest) universe compels one of the most unique group of heroes ever assembled to take on the most mysterious foe they have ever encountered. What started in Detective Comics #1027 explodes out of Dark Nights: Death Metal to tell the story of the Generations-spanning history of the DC Universe! Join the original Batman, Kamandi, Starfire, Booster Gold, Dr. Light, Steel, Superboy, and Sinestro in their quest to save the universe before.T I M E.R U N S.O U T ."--Provided by publisher.