Thor (comics)
Thor, a founding member of the superhero group the Avengers, often battles his evil adoptive brother Loki, a Marvel character adapted from the Norse god of mischief. He is among Marvel's most powerful superheroes. Many recurring characters in his stories are based on Norse Mythology. Apart from this main superhero, Marvel features a number of characters based on him.
Midgard Serpent (Marvel Comics)
Being aware of the prophecy regarding his son's death, Odin (King of the Norse gods) cheats fate during a false Ragnarok by replacing Thor with a surrogate known as Red Norvell, who, after gaining the power of Thor and his hammer, dies battling the Midgard Serpent after it dives into the ocean. The prophecy fulfilled, Thor drives off the creature. The Midgard Serpent reappears briefly when a group of Odin's enemies feed the "Golden Apples of Idunn", intended for the Norse Gods, to the creature, intending to weaken the gods before an attack. It is used as a bridge by Tyr and Loki's army. Thor imprisons the creature and forces it to return the apples.