Detective Comics #604 1989

Detective Comics #604, published by DC in September 1989, initiates "The Mud Pack" storyline. Preston Payne (Clayface III) escapes Arkham Asylum with assistance from Sondra Fuller, whose identity as Lady Clay (Clayface IV) is revealed. Basil Karlo, the original Clayface, assembles them, alongside the remains of Matt Hagen (Clayface II), to form a unified villainous team. This issue is notable for bringing together four iterations of Clayface for the first time, establishing a significant new threat for Batman.