Batman #403 1986

Batman #403, published in 1987, features "One Batman Too Many." In this pivotal story, the deranged Tommy Carma, convinced he is the Caped Crusader, escapes Arkham Asylum. He then discovers the Batcave, dons a Batsuit, and steals the Batmobile, leading to a confrontation with the real Batman. This issue is notable for collectors as it concludes the compelling storyline of a Batman impostor and showcases a unique exploration of the hero's psychological impact, directly preceding the iconic "Year One" saga.