Batman is hiding a dark secret that could threaten the very existence of the multiverse! Leading directly into the blockbuster event DARK NIGHTS: METAL, this is an epic story that spans generations, featuring DARK DAYS: THE FORGE and DARK DAYS: THE CASTING, as well as classic DC stories that built the foundations of Metal, including FINAL CRISIS #6-7, THE RETURN OF BRUCE WAYNE #1, plus (from the New 52 era) BATMAN #38-39, NIGHTWING #17 (current series) and more!