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Thor is a fictional superhero who appears in publications published by Marvel Comics. The character first appears in Journey into Mystery #83 (August 1962) and was created by editor-plotter Stan Lee, scripter Larry Lieber, and penciller Jack Kirby. Debuting in the Silver Age of Comic Books, the character is based on the Thor of Norse mythology. Thor has starred in several ongoing series; limited series and has been a perennial member of the superhero team the Avengers, appearing in each of the four volumes. The character has also appeared in associated Marvel merchandise including animated television series; clothing; toys; trading cards and video games.

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 on holiday in Norway, Blake witnesses the arrival of an alien scouting party. Blake flees into a cave, and after discovering Thor’s disguised hammer Mjolnir, and striking it against a rock, transforms into the Thunder God.

Defeating the aliens, Thor shares a double life with his alter ego: treating the ill in a private practice with nurse – and eventual love – Jane Foster and defending humanity from evil. Thor’s presence on Earth almost immediately attracts the attention of his stepbrother and arch-foe Loki; who returns repeatedly to Earth in a bid to destroy Thor. Loki is also responsible for the emergence of three of Thor’s principal foes: the Absorbing Man; the Wrecker, and the Destroyer. On one occasion, Loki’s tactics are accidentally beneficial – although successful in using an illusion of the Hulk to draw Thor into battle, it results in the formation of the superhero team the Avengers, of which Thor is a founding and longstanding member

Like all Asgardians, Thor is not truly immortal but relies upon periodic consumption of the Golden Apples of Idunn to sustain his lifespan, which to date has lasted many millennia. Being the son of Odin and the elder goddess Gaea, the character is physically the strongest of the Norse gods, and has performed such feats as almost lifting the entire World Serpent (stated to encircle the Earth multiple times) and hurling the Odinsword, an enormous mystical blade of incalculable weight, through a Celestial. If pressed in battle, Thor is also capable of entering into a state known as the “Warrior’s Madness” (“berserksgangr” in Norse), which will temporarily increase his strength tenfold.

The character also possesses high resistance to physical injury;(e.g. rocket fire; intense cold; falls from orbital heights and the gravity of a neutron star) superhuman senses (“super-breath” ; tracking objects traveling faster than light; hearing cries from the other side of the planet); speed; agility and reflexes. Thor has also shown the ability to regenerate when wounded. Like all Asgardians he has resistance to all Earthly diseases and some resistance to magic. However, magic exceeding the Odinforce, like Dormammu’s, can overwhelm the enchantment that transforms him between immortal and mortal forms.

As the Norse god of Thunder, Thor can summon the elements of the storm (lightning; rain; wind; snow) and uses Mjolnir as a tool to focus this ability. As the son of the Earth goddess Gaea, Thor has shown some control over the Earth.

source:  Wikipedia