Based on the fire giant Surtr from norse mythology, Surtur is a fictional character that appears in comic books published by Marvel Comics. The character first appears in Journey Into Mystery #97 (Oct 1963) and was created by Stan Lee & Jack Kirby.
Surtur is a fire demon native to the extradimensional plane of Muspelheim land of the fire demons, located on the continent of Asgard, and first appears in the title Journey Into Mystery. The character's first encounter with the Asgardian ruler Odin is told in flashback and establishes their enmity when Surtur is imprisoned by Odin inside the Earth after forming an alliance with the Trolls, although he gives him a winged horse, hoping to be released one day. Surtur reappears in the title Journey Into Mystery, having been freed by Odin's adopted son, Loki, who intends to usurp Odin and rule Asgard. Together with the Storm Giant Skagg, the character invades Earth, although the pair are defeated by Odin, his son the Thunder God Thor and fellow Asgardian Balder. Using Odin's sword, Thor stops Surtur from melting the ice caps, instead trapping him on a metorite.
In the title Thor the seer Volla predicts that Loki will free Surtur and other enemies of Asgard and eventually bring about Ragnarok - a war that will end the Norse Gods. The character features in the title Avengers when summoned - together with ice giant Ymir - to Earth by the cult the Sons of Satannish. The entities are banished by the combined efforts of superhero team the Avengers; the hero the Black Knight and the sorcerer Doctor Strange.
Surtur becomes a recurring foe in the title Thor, and first attempts to invade Asgard, but is repelled and imprisoned.
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Official Site: Marvel Comics
Links: wiki entry immortalthor.net entry marvel.com entry