Warning! Spoilers ahead for Thor: Love and Thunder
Thor: Love and Thunder helps explain the God of Thunder's seemingly drastic change as a character between his early films and Thor: Ragnarok. While the real-life reason has to do with director Taika Waititi breathing new life into the franchise with the third installment, released in 2017, key flashbacks in the fourth Thor movie have provided the in-universe reasons for the Son of Odin's personality changes and increased humor, and much of it has to do with Thor's ex-girlfriend Jane Foster.
As seen in Thor: Love and Thunder, Jane Foster is the new wielder of a reforged Mjölnir, becoming the Mighty Thor as an honorary Asgardian. This leads to Thor and Jane's reunion as they take on Christian Bale's Gorr the God Butcher. During their adventure, the exes examine their past relationship and why it ultimately didn't work out, and they explore the possibility of reigniting their romance in the present. With their relationship having ended around the same time as Avengers: Age of Ultron, it's been years since Thor and Jane were an item.
Related: Thor: Love And Thunder Fixed The MCU's Jane Problem
Thankfully, Thor: Love and Thunder provides flashbacks that cover the time when Thor and Jane were a couple between films. As such, these moments are crucial to understanding why the Odinson of the first two Thor movies is so much different compared to the one seen in Thor: Ragnarok and since. Here are the biggest changes Thor underwent as a character as well as Jane's role in his overall evolution as the Mightiest Avenger.
While all of Marvel's heroes have varying degrees of humor, Thor used to be one of the most stoic and serious Avengers in the MCU's first phase. The only member of
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