Thor's father Odin decides his son needs to be taught humility and consequently places Thor (without memories of godhood) into the body and memories of an existing, partially disabled human medical student, Donald Blake. After becoming a doctor and thoroughly believing himself to be the young surgeon Blake, he later discovers Thor's disguised hammer and learns to change back and forth into the Thunder God. The real Blake's persona remains elsewhere until many years later, after Odin becomes satisfied of Thor's humility and lifts the spell, thereby removing the need for a mortal alter ego.
Thor's principal foe is his adopted brother Loki, who has hated Thor since childhood. Although a master of magic, Loki usually avoids direct confrontations for fear of angering Odin. As the son of Odin and Gaea, Thor's strength, endurance and resistance to injury are greater than the vast majority of his superhuman race. He is extremely long-lived (though not completely immune to aging), immune to conventional disease, and highly resistant to injury. His flesh and bones are several times denser than a human's. As Lord of Asgard, Thor possesses the Odinforce, which enables him to tap into the near-infinite resources of cosmic and mystical, enhancing all of his abilities. With the vast magical power of the Odinforce, Thor was able to even dent Captain America’s shield with Mjolnir. Thor wields Mjolnir, a hammer forged from uru metal. Mjolnir is virtually unbreakable, and allows Thor to command the powers of the storm, causing rain, thunder and lightning. Thor can channel the storm’s fury into devastating blasts of energy that can destroy even secondary Adamantium. He can also channel his godly energies through Mjolnir into blasts so powerful that they can slay even immortals. Mjolnir can absorb other energies into itself, which Thor can then release.
