A Zero Month crossover issue. The Batman is on the hunt again; this time, he is after a group of hitmen called the Stone Brothers. Ex-military, the Stone Brothers were hired to go after crime boss Mick Molloy, but found Batman instead. While Batman takes on the brothers, a separate group of criminals are convinced that the Batman is after them. After being spooked by every little noise, the gang surrender themselves to Commissioner Gordon. Batman, while remembering his past, takes down the Stone Brothers, and returns to the Batcave, his mission fulfilled.
- Except for Batman all other characters have cameo flashback appearances.
- "DC Universe 20" one page Zero Hour advertisement featuring the front page of the Daily Planet with the headline "Zero Hour for Earth?"
- "DC Universe 21" a one page memorial dedicated to Neal Pozner. Artwork of three headshots of Neal by Phil Jimenez.