From the Time-Stream history files of Braniac 5

A time displaced Penny Thompson finds herself in a world she barely recognizes with super heroes she barely recognizes. And she has unknown emerging superpowers to deal with too. And super villains. She can't forget the super villains. Join her on her journey as she meets the Legion of Superheroes.

Note: Continuity is iffy, but has a little of young justice in it. Creative liberties will be taken.