Batman #404-407 (Year One Complete) - Frank Miller and David Mazzucchelli's "Year One" storyline begins in issue #404, establishing Bruce Wayne's origin as Batman through a four-issue narrative arc. The series features Todd Klein's redesigned Batman logo and Richmond Lewis's coloring throughout the complete arc.
1st appearance of Holly Robinson, becomes an ally of Catwoman
1st appearance of Sarah Essen, a Gotham City police officer
1st appearance of Carmine Falcone, the head of an organized crime family
1st appearance of Officer Stanley Merkel, in mainstream universe, first introduced in The Dark Knight Returns by Frank Miller
1st appearance of James Gordon Jr., the infant son of Commissioner Gordon