Batman Shadow Of The Bat #51 1996

In Batman: Shadow Of The Bat #51, part two of 'Nightmare on Gotham,' Batman succumbs to the mind-warping gas of the villain Narcosis. As Batman battles to retain his sanity, Narcosis implements a sinister plan to drive all of Gotham City mad by poisoning the city's milk supply. Commissioner Gordon discovers an unconscious Batman, who eventually awakens to confront the threat. This issue continues a key storyline where the Caped Crusader faces a psychological challenge while racing against time to save Gotham from widespread insanity.