It is a world much like our own where, in 1908, a small comet impacted in the Tunguska forest north of Siberia. An event fantastic in itself, though in the world of Power Heroes it was also the harbinger of the Age of Metahumans. In that world, "super powers" are real.

It's in that world that Jesse Wells (a.k.a. Liberty: The American Girl) uses her powers to uphold the good. You can learn more about it in the sections listed below:

• Harbinger of the Metahuman Age: The Tunguska Event
• The Source of "Super Powers": The Metagene
• "Artificial" Metahumans: Mutants
• A Lexicon of Metahumans and Teams