Based on the frost giant of the same name from Norse mythology, Ymir is a fictional character that appears in publications published by Marvel Comics. The character first appears in Journey Into Mystery #97 (Oct. 1963) and was created by Stan Lee and Jack Kirby.
The character Ymir first appears in Journey Into Mystery, and as with the mythological version considers all other forms of life — with the exception of his kin the Frost Giants of Niffelheim — to be aberrations that must be destroyed. He was among the first Asgardian creatures. The next story depicts an early battle with and subsequent imprisonment by being lured into a trap and imprisoned in a ring of magical fire by Odin, King of the Norse gods while attempting to bring eternal winter to Asgard with the other giants. Ymir is mentioned in Savage Tales in a story set in the prehistoric Hyborian Age. Barbarian hero Conan encounters his daughter, Atali, and slays two of her brutish brothers.
Ymir reappears in a two-part storyline in Avengers and Doctor Strange being summoned to Earth with the fire demon Surtur by the cult the Sons of Satannish. The pair are defeated and banished when the heroes trick the two into fighting one another. Ymir and Surtur reappear in Thor, and invade the realm of Asgard. Both characters, however, are defeated when God of Thunder Thor uses the Odinpower to banish the pair to the other-dimensional Sea of Eternal Night. Ymir reappears in the publication Marvel Super-Heroes, and with the Frost and Storm Giants launches attack on Asgard. On this occasion the character and his allies are stopped by Thor and his half-brother, Vidar.
Ymir appears in an issue of the limited series X-Men: First Class, which is set during the early days of the modern Marvel universe. The original X-Men encounter a group called the Sons of the Vanir who summon Ymir to Earth, and after a brief battle Thor uses his mystic hammer Mjolnir to return the character to Niffelheim.
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Links: Wikipedia: Ymir Marvel Database: Ymir Comic Vine: Ymir