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In a moment of wistful affection for his girlfriend, Thor asked his trusty hammer to always protect Jane, and in doing so unwittingly enchanted Mjolnir to do just that. Just like Thor's father Odin once enchanted the hammer to only be lifted by someone who is worthy, Thor cast a spell that let Jane use its powers.
However, the film also implies that the hammer only sees Jane as worthy because Thor unintentionally revised the rules of Mjölnir, giving it the power to protect her. Captain America didn't need anything special for the hammer to see him as worthy – he's able to wield it without issue in Avengers: Endgame.
A happy-go-lucky, ABBA-soundtracked montage, the scene features Thor making Mjolnir promise that it will always protect Jane, no matter what — even if it means coming back from the “dead” after being smashed to pieces by his villainous sister Hela.
However, while Mjolnir enhanced Jane's strength and combat skills while she wielded it, the weapon didn't cure her cancer. The hammer also prevented her from responding to cancer treatment, as she was using all her strength to wield Mjolnir and so had no strength left to fight the disease.
Years later, Mjolnir reforged itself for Jane Foster, transforming her into the Mighty Thor. It was able to stave off her stage 4 cancer, but weakened her mortal form's ability to stave the cancer off every time she harnessed the hammer's abilities. After she finally succumbed to her cancer, Thor reclaimed the hammer.
But after watching new Thor in action, he admits that she deserves the mantle. Thor Odinson initially suspects Jane might be this new hero. But he eliminates her from his list of suspects because she is going through chemotherapy for breast cancer, which, he reasons, would make her too weak to fight.
It's her cancer diagnosis and her struggles with chemotherapy that make her worthy to wield Mjolnir in the comics, given that her powers block the treatment, and the cancer progresses every time Jane Foster wields Thor's power – yet she persists to fulfil the role the universe needs her to, and this may unfold ...
In the first Thor film, the title character was deemed unworthy by his father Odin, who banished his son to Earth until he proved otherwise. The story ultimately ended with the thunder god's self-sacrifice reconfirming his worth, allowing for Thor's first reclamation of Mjolnir.
Is Thor still worthy in Thor: Love and Thunder? It is pretty clear that Mjolnir chose Jane, not because Thor was unworthy, but because Thor's oath had instructed it do so. Sadly, the hammer cannot cure Jane's cancer, and can only transform and temporarily empower her.
In the comics, Jane is worthy to wield the power of Thor because she chooses to. And despite the fact that using Mjolnir accelerates the cancer in her body, she will continue to use it because it is the right thing to do.
The two brothers, clouded by pride and hate, send the Destroyer after Jane, despite the new Thor saving others and fighting for what's right. While she gets thrown around, Thor refuses to back down, which is another reason why Jane is worthy of being Thor.
Gorr planted seeds of doubt in Thor's mind, forcing him to question whether gods truly are as noble and benevolent as they seem. Nick Fury seizes on that doubt in 2014's Original Sin, telling Thor "Gorr was right" and rendering the god of thunder so disillusioned that he's no longer able to lift Mjolnir.
What did Jane Foster whisper in Thor's ear? The catchphrase that Jane used out loud earlier in the film was, “eat my hammer”.
Originally there was no restriction placed on the hammer for who can use it but after Thor's reckless behavior, Odin Borson placed an enchantment on it. This spell read "Whosoever holds this hammer, if he be worthy, shall possess the power of Thor." Only those deemed worthy to lift Mjolnir can.
Mjolnir is a connection to Thor as he is pre-Infinity War, still finding his footing as a hero and learning how to find power within his relationships instead of within his physical ability. In this sense, Mjolnir is almost like a best friend to Thor.
Mjolnir is a hammer, and was enchanted by Thor's father, Odin, so that only those the hammer deemed "worthy" are capable of wielding or even lifting it. Stormbreaker is an axe, and although it does not have such a worthiness enchantment, its power is such that a mere mortal attempting to wield it would be driven mad.
Gorr's daughter is played by India Rose Hemsworth, the daughter of Thor himself, Chris Hemsworth, and actress Elsa Pataky. Hemsworth has talked about how his children are in the movie, saying "...Taika had his children in there.
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Love is the daughter of Gorr the God Butcher, whose death by starvation triggered her father's murderous crusade against all gods for forsaking them. She was ultimately resurrected by the cosmic entity Eternity in accordance with Gorr's wish, brought on by Thor's advice.
The movie never explicitly states how Jane arrives at the gate of Eternity so quickly, but the science scene earlier in the movie explains it when combined with a throwaway reference to Valkyrie's horse being bale to make portals.
Hence, Mjolnir determines worthiness based on Odin's definition of worthiness. However, since Mjolnir also has a conscious being within it, in the form of God Tempest, another likely explanation is that it is God Tempest that determines the worthiness.
In the stories (and the Marvel movies), we see the god throwing the short-handled hammer at his enemies. The top of the Mjölnir often (but not always) comes to a slight point, giving the overall object a somewhat diamond shaped appearance. This shape is similar to an inverted Tyr rune.
During the events in the Original Sin storyline in 2014, Nick Fury, with the powers of the Watcher, whispered something to Thor that caused him to lose the ability to use the Mjolnir, making way for another worthy character that soon took the name (and powers) of Thor: Jane Foster.
But once called out on his cowardice by Thor, he quietly admitted to being afraid of Gorr, as he wielded the Necrosword and was capable of killing all gods for good - but downplayed the threat in order to maintain his mighty image, as well as to not cause panic amongst his peers.