Son of Odin and the Earth goddess Gaea, Thor is a child of two worlds and self-proclaimed defender of the Earth. Cast to Earth in mortal form by his father to learn humility, Thor found love in a mortal woman and friendship as a founding Avenger.
In his adventures, he has discovered Ego the Living Planet, learned the mysteries of Ragnarok, and the faced the judgment of the all-mighty Celestials. In the classic run by Walt Simonson, Thor faced all out war between Asgard and Surtur followed by a siege on hell itself for the souls of men. For a time, Thor even became king of Asgard before their world was destroyed. Reborn years later, Thor reformed Asgard on Earth leading to a climactic battle in the Siege event.