Superman: Action Comics: The Oz Effect

In this single-issue 2019 DC special, writer Rob Williams and artist Guillem March pull back the curtain on the mysterious Mr. Oz, a secretive figure who had been observing Superman from the shadows. The story delivers a pivotal revelation that recontextualizes the Man of Steel's recent trials, tying directly into the larger "Superman Reborn" era. It's a concentrated, character-driven moment that rewards readers following the long-running Action Comics saga.