Jane Foster might be known as one of Thor's love interests in Marvel Comics and the MCU, but she eventually takes on the mantle of Mighty Thor in Thor: Love & Thunder. Jane's transformation into the Goddess of Thunder will occur in the upcoming MCU movie Thor: Love and Thunder. Her character arc as Mighty Thor looks to follow in the footsteps of her comic book counterpart. But how did Jane become worthy enough to wield Mjolnir?
Outside of the MCU Thor franchise, Jane's first comic book appearance occurred in 1962 with Journey into Mystery #84 as a nurse for Dr. Donald Blake. Jane found herself stuck in a love triangle with Blake and Thor, not realizing they were the same man: Blake was Thor's mortal host. Thor later took Jane to Asgard, where she was granted immortality. Still, Odin later stripped her of those powers believing she wasn't courageous enough to harness them and sent her back to Earth with no recollection of her time on Asgard. She reappears after years in Thor: Love & Thunder, but she's worthy of wielding Mjolnir this time.
Throughout Thor's history in Marvel Comics, Jane Foster remained a supporting character. She eventually became a doctor and married Dr. Keith Kincaid. Even though she was married to another man, Jane continued her involvement in the life of Thor and his various conflicts. During the Civil War story arc, Jane took Captain America's side and joined in assisting the Secret Avengers. Thor appointed Jane as the Midgard representative in the Congress of the Worlds. Shortly after, Jane went through several life changes, including her notable stint as Mighty Thor. In Thor 4, Jane will operate under the new moniker "Mighty Thor," and the latest footage reveals that she's quite a force to be reckoned with. Here's the character of Mighty Thor explained, and how Jane Foster became worthy enough to pick up Mjolnir. -Collider
