Loki is a fictional character appearing in American comic books published by Marvel Comics. Created by writer Stan Lee, scripter Larry Lieber, and penciller Jack Kirby, a version of the character first appeared in Venus #6 (August 1949). The modern day incarnation of Loki first appeared in Journey into Mystery #85 (October 1962). He is the adopted brother and often the enemy of the superhero Thor.

With the Asgardian population other than Thor still wary of Loki, Loki revealed to his brother that he was attempting to learn more about Earth and humans, to which Thor approves. When a magpie exploded in his quarters carrying a key, it led to a chain of events where at the end, Loki was contacted by an echo of his former incarnation, who revealed he chose to sacrifice himself fighting the Void as part of a greater plan which would involve his death and return. The child Loki refused to follow this path, wanting to be his own person, and transformed the spirit of his former self into a magpie named Ikol. On returning to Earth, he witnessed Odin striking down Thor.  Odin prepared all of Asgard for an unknown battle and imprisoned Thor for attempting to protect Midgard from being scoured. Loki, who disagreed with Odin's actions, was put to work by Volstagg into cleaning the stables of Thor's goats to keep him out of trouble and danger. Using the wool of one of the goats, Loki descended into the roots of the World Tree at the advice of Ikol to ask questions from the Nornish women who live there. After receiving his answers, Loki wept but decided to turn to the imprisoned Thor for his opinion before making his final decision. Breaking into the prison by stealth, Loki asked his brother what he would do if he had to let something bad happen in order to prevent something worse from happening and what if it cost him everything. With Thor's answer, Loki decided to free one of the imprisoned Hel Wolves and bind it to him in servitude using the bridle of Thor's goats. He revealed he needed help from one more 'personage' before heading for the realm of Hela.  Having recovered Thor's hammer after he was killed and erased from memory following the war against the Serpent, Loki was able to work with the Silver Surfer to restore the hammer to its natural state and send it to Thor in the afterlife, restoring his memory and allowing him to fight his way back into the realm of the living. After Thor's return, Ikol would afterwards reveal that circumstances had been manipulated to force the young Loki to allow his former personality to subsume him and live again, his former slate wiped clean by the "new" Loki's actions. During his adventures, the young Loki had inadvertently helped create and was tied to a powerful artifact that was about to be used by Mephisto to conquer all the Hells and ultimately everything. However, if the new Loki ceased to be, the artifact would lose all power. Seeing no other option, Loki allowed Ikol to become Loki again, ceasing to be, but he warned beforehand that the Ikol personality was incapable of true change and believed this older persona would ultimately be stopped by those who always stopped him before, his brother included.

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