The Thirteenth Man

Alternate-universe science-fiction Daria fanfic by The Angst Guy. Through a quirk in quantum physics, Mack Mackenzie has become a super-powered hero on the level of Superman, but he hides his true identity and has not yet (at the story's start) revealed himself to the general public.

Tied for "Favorite Science Fiction" story in the 1st Daria Fanworks Awards

Links
The Thirteenth Man at The Angst Guy's story website