Jane Foster

Jane Foster made her debut in Journey into Mystery #84 (1962), arriving just one issue after Thor himself burst onto the Marvel scene. In those early Silver Age stories she played the role of a nurse working alongside the mortal Donald Blake, unaware that her mild-mannered colleague secretly wielded the power of a god. That first appearance is a cornerstone Silver Age key, and pristine copies continue to command serious attention at auction as the foundational book for one of Marvel's most dramatically evolved characters.

For decades Jane occupied a supporting role in Thor's mythology, but everything changed with Jason Aaron's landmark run beginning in Thor (2014) #1. When Thor Odinson became unworthy of Mjolnir, it was Jane — quietly battling breast cancer — who proved herself worthy and lifted the hammer, transforming into a thundering new Thor. The twist that her mortal illness made the transformation even more dangerous gave the story an emotional weight rarely seen in superhero comics. The first issue of that 2014 series is an undeniable modern key, and the eventual reveal of her identity in Thor (2015) #8 is another high-demand issue that collectors actively chase.

Jane's evolution continued when she took on the mantle of Valkyrie following the War of the Realms event, adding yet another powerful alias and a fresh ongoing series to her legacy. Her membership across teams including the Avengers, the Congress of Worlds, the League of Realms, and the Thor Corps speaks to just how central she has become to the wider Marvel Universe. The Mighty Thor run also produced some of the most visually striking covers of the modern era, making back-issue hunting for her key books a rewarding pursuit on multiple levels.

With Jane Foster now firmly established as a headlining character — bolstered further by her prominent role in the Marvel Cinematic Universe — her key books span sixty-plus years of publishing history. Whether you are hunting a mid-grade Journey into Mystery #84, a raw first-print copy of the 2014 Thor run, or her Valkyrie debut issues, Jane Foster's bibliography represents one of the most compelling long-term collecting arcs in all of superhero comics. Few characters offer this combination of Silver Age history and genuine modern key status.