Watchmen, written by Alan Moore and illustrated by Dave Gibbons, is a groundbreaking alternate history graphic novel set in a world where superheroes exist. The story takes place in an alternate version of the United States during the Cold War era, where the presence of superheroes has greatly influenced politics and society. Watchmen explores complex themes such as power, morality, and the nature of heroism, while also providing a thrilling and suspenseful narrative. With its intricate plot, deep character development, and thought-provoking themes, Watchmen is widely regarded as one of the greatest graphic novels of all time.