Warning: Spoilers for Thor: Love and Thunder
Mjolnir made its triumphant return in Thor: Love and Thunder, but it didn't come back for Thor, despite the God of Thunder still being worthy. Thor's trusty hammer, Mjolnir, debuted in the MCU before the God of Thunder himself, having appeared in the post-credits scene of Iron Man 2. Since then, only a handful of MCU characters have successfully lifted Mjolnir because it has become the test of worthiness.
In Thor: Ragnorok, Mjolnir was destroyed by Thor's sister Hela, and up until Thor: Love and Thunder, he had been fighting with Stormbreaker, an enchanted axe forged in Nidavellir. While Stormbreaker is an excellent weapon, Thor makes it clear in Love and Thunder that Mjolnir is his favorite. But Mjolnir did not come back from the dead just so Thor could fight with it, the hammer was rebuilt for a much deeper reason.
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Thor: Love and Thunder put into question whether Thor is still worthy because rather than coming back for Thor, Mjolnir magically reformed to save Jane from her terminal cancer. If Mjolnir had the ability to reform all along, then it is reasonable to think that it could have done so some time ago for Thor. But that misses the point because it's Thor's time away from Mjolnir during the events of Avengers: Infinity War and Avengers: Endgame that proves that he is worthy with or without his comfort blanket weapon. Ultimately, Love and Thunder confirms that the God of Thunder is still worthy as Thor wields Mjolnir once more, but the delay both helps Jane and proves Thor's worthiness on a much deeper level.
As Taikai Waititi's movie title suggests, the theme of love was a huge part of Thor: Love and Thunder, and it
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