Batman / Flash: The Button

In this 2019 DC one-shot, writer Joshua Williamson and artist Howard Porter deliver a single-issue crossover that picks up threads from "The Flash" and "Batman" to explore a mysterious, time-altering event. The story hinges on a strange button discovered in the Batcave, drawing the Dark Knight and the Fastest Man Alive into a shared mystery that ripples across the DC Universe. A concise but pivotal chapter, it serves as a key bridge between major storylines, showcasing the unique dynamic between two of DC's most iconic heroes.