**Ultimate Thor** is part of the Ultimate Marvel series that reintroduces Thor in a modern context. In this storyline, Thor, initially thought to be delusional for claiming to be a god, is an environmental activist who is later proven to be a true Asgardian deity. The story reveals his struggle against global threats, especially from his evil brother Loki. Thor must overcome an identity crisis and skepticism from other heroes to protect Midgard (Earth) and Asgard. The discovery of the Mjolnir hammer and Thor's recognition as a legitimate god are pivotal in the battle against dark forces.