Alien monster (Watchmen)

This monster was created by Ozymandias as part of a plot to stop the United States from entering into a nuclear war, by making them think that an alien invasion was imminent, causing them to join forces with the Soviet Union for a common to fight off the invasion. The result was the deaths of millions in New York City, and even though Nite-Owl, Silk Spectre and Doctor Manhattan were aware of Veidt's crime, they knew that they couldn't tell the world, because if they did, it could bring the world back to the brink of disaster. Rorschach however was unwilling to compromise, and he decided he was going to tell others about what had happened. But he is stopped by Manhattan, who kills him in Antarctica.

Appearances
Saturday Morning Watchmen