various reasons. When Bruce was overcome with night terrors, Robin suggested that Ace sleep beside him. Ace disappeared from the Batman comics after Julius Schwartz took over as editor in 1964. His last appearance was a cameo in a story where Batman had lost his fighting spirit. Post-Crisis A version of Ace is seen in the cosmic realm of Limbo when the hero Animal Man takes a trip through it. A post-Crisis version of Ace was reintroduced in Batman #462 (June 1991) by the late Alan Grant and the late Norm Breyfogle, although he has been rarely seen in recent years. This version was originally a guide dog belonging to a blind Native American named Black Wolf, who called him "Dog". The dog assisted Batman in fighting criminals from Black Wolf's tribe. Following Black Wolf's death, Batman adopted Dog, renaming him Ace. He did not wear a mask, nor was he ever referred to as Bat-Hound, and has the appearance of an English Mastiff with a bat-shaped dark patch on his flank. Ace has at times helped Batman on cases and is depicted to be very affectionate towards his owner and vice versa. After Batman is disabled by the villain Bane, Azrael takes over the identity and ejects Ace, Nightwing, Robin and Harold Allnut from the Batcaves. Harold, a trusted confidante of Batman, takes in Ace; they live in a part of the caverns that Azrael is unfamiliar with. To keep busy, Ace enjoys playing with a robotic mouse built by Harold. Ace disappeared without explanation after the events of the No Man's Land storyline in the late 1990s. He cameos in Ambush Bug: Year None. A traditional Ace was seen in Final Crisis: Superman Beyond 3D. He is in Limbo with other "forgotten characters", such as Gunfire, Geist, Hardhat of the Demolition Team and Merryman of the Inferior Five. Merryman explains that everyone is here where no stories exist, because nobody is writing about them. Despite this, Superman and his allies work to rescue all the residents of Limbo, who then assist in the battle against the cosmic threat of Mandrakk. The original Ace appeared in a flashback scene in Batman Inc. #4, thus making the current canon status of the Post-Crisis Ace unclear. In this story, Ace is trying to play with Robin, who is fuming over Kathy Kane, a.k.a. Batwoman, and her influence on Batman. The New