1. 'Batman: The Dark Knight Returns'
There's no competition. Frank Miller's grim but ultimately celebratory vision of a dark, depraved future Gotham City and the grizzled old Batman who comes out of retirement to save it made Miller a legend. In tandem with Watchmen, it transformed the landscape of superhero comics forever. Forget Chris Nolan or Tim Burton, cartoon or comic book or video game – without the original TDKR, Batman as you know him would not exist.