Odin is the ruler of all of Asgard and Allfather of those who live there. He watches over the Nine Realms. His son is Thor and he adopted Loki of the Frost Giants. He sleeps once a year each winter to regain his strength in a sleep cycle known as the "Odinsleep" to protect his kingdom from invaders like the Frost Giants. He is a major character in The Avengers: Earth's Mightiest Heroes.
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