Doomsday is a monstrous fictional antagonist from the Superman universe, best known as one of Superman’s most dangerous enemies. He is a nearly unstoppable Kryptonian-engineered creature created for destruction, with immense strength, rapid adaptation, and an ability to survive repeated deadly attacks. In stories, Doomsday serves as a catastrophic force of nature rather than a typical villain, and he is most famous for killing Superman in the landmark storyline "The Death of Superman."