Sif is a fictional character appearing in comic books published by Marvel Comics featuring Thor. Based on the mythological being of the same name, Sif was created by Stan Lee and Jack Kirby and first appeared in Journey Into Mystery #102 (March 1964). As an Asgardian warrior and lover of Thor, Sif often accompanies Thor into battle and spends much of her time worrying about and searching for him. She has also battled alongside Balder, who has developed an unrequited attraction to her, as she never shows affection for anyone but Thor and certain individuals who have proved worthy to wield his hammer, Mjolnir, such as the noble alien warrior, Beta Ray Bill and the mortal Eric Masterson.In Avengers: Earth's Mightiest Heroes , she was seen leading the Valkyries alongside Brunhilde against a trio of Frost Giants who had besieged both Giant-Man and an unconcious Wasp. She later showed that she was a remarkable swordswoman and equestrian, and commented on both Giant-Man's status as a giant and man, as well as her hated rival Enchantress. Sif assisted in several battles during Loki's war, but was defeated. She was later present when Odin took his place on the throne, and cheered for the Avengers alongside her fellow Asgardians.Sif overheard how Thor missed Jane Foster, a mortal from Midgard. She interruped them remarking Thor that he should return to Midgard. Thor went away after Odin arrived and reported that Surtur was missing from Muspelheim and the Warriors Three reported that something was troubling Heimdall and Thor checked it out. She was present when Odin summoned Beta Ray Bill who was holding Mjolnir. She attacked without hesitation the Korbonite, but was easily defeated. He was then taken hold by Odin and summoned Thor. Bill explained his backstory and Sif offered to help him to save his people from the Fire Demons and offered her sword after Odin rejected the proposal of Thor giving Mjolnir to him and suggested that they should take him to Eitri. Sif watched through how Thor convinced Eitri to make a hammer for Bill.After Bill acquired Stormbreaker, they went to the Skuttlebutt, which was attacked by the Fire Demons. She went into the ship and activated the system of the Skuttlbutt, she ordered the ship to go after the Enchantress who was commanding the Fire Demon army, but was stopped by the ambush of the Fire Demons. She went to the place of the sleeping pods where the Korbonites rested and fended off the Fire Demons, until they vanished after Thor and Bill defeated the Enchantress. After they arrived at the Skuttlebutt, she offered to Bill to protect the Korbonites, but Bill refused since he thought her duties lied elsewhere. She bade farewell to Bill and left with Thor apologizing to him for earlier.In the Marvel Cinematic Universe, Sif is convinced by Thor to attack Jotunheim, in response of an attempt by some Frost Giants to steal the Casket of Ancient Winters. While in Jotunheim, Sif fights alongside with her friends against an army of Giants led by Laufey himself, and manages to slain many of them, but is forced to flee when they're outnumbered. Eventually, the team is saved by Odin, who intervenes to prevent their killing. Helpless, Sif assists to Thor's banishment on Earth.Some days later, Sif persuades the Warriors Three to ask Odin to recall Thor back home, but when they arrive in the throne room, they find Loki sitting as the new ruler of Asgard, as a substitute to Odin who's fallen into Odinsleep. Loki denies their request to call his stepbrother back, but they decide to ignore his order and to go to Midgard anyway. Heimdall agrees with them and opens Bifrost Bridge for them, and the four gods arrive on Earth, in New Mexico. Here, they easily spot Thor, and find out that he's been tricked by Loki's lies. Briefly later, The Destroyer is sent to Earth by Loki to kill Thor and the other Asgardians, and Sif engages it in battle with her friends. While the Warriors Three buy her some time, Sif climbs a rooftop and attacks the Destroyer from above, piercing its throat with her spear. Immediately after, the Destroyer regenerates itself and almost vaporizes her with his energy blast. Sif flees with her companions, leaving Thor, who claims to have a plan, behind, but only to assist his sacrifice and his rebirth in his divine form. Back in Asgard, Sif brings Heimdall to the Restore Room, while Thor defeats Loki once and for all.Along with other Asgardians, Sif celebrates Odin's return on the throne and Thor's return in the realm, participating to a gargantuan banquet. Show less «