His successful pitch included 14 pages that eventually would be published in 2000 as Batman: Ego. Described by Cooke as "What if Batman and Bruce Wayne were able to sit down and talk about what it is they do?", the internal dialogue of Batman: Ego between Bruce Wayne and Batman was inspired by the 1981 film My Dinner with Andre.
Batman Ego sees Batman tracking down the Joker through a henchman Buster Snibbs, only for Snibbs to commit suicide, knowing that the Joker will know he betrayed him. Bruce Wayne is consumed by guilt and decides to retire his alter ego, but instead divides his mind into competing narratives, his Batman Id versus his Bruce Wayne Superego.
They debate their shared history, Bruce's childhood, Batman's beginnings, and the rise of Gotham's supervillains. Batman refuses to be retired, and decided that they must kill the Joker. Bruce Wayne refuses. After much psychological torment, the two halves reach a compromise, Bruce Watne will accept the guilt and responsibility of Batman's crusade, as long Batman can accepts he must stand for hope as well as fear. As The Joker escapes again.