Box to the Future is a comedy-scifi story by Smileyfax.
During the events of "Boxing Daria", our heroine crawls into the box that reminds her of a childhood event... and finds herself crawling out into the past, confronted by her own childhood self. Now Daria has to figure out how to get back and gets a first-hand account of what her parents went through with her!
It won Favorite Supernatural or Fantasy Non-Horror in the 5th Daria Fanwork Awards.
Box to the Future at FF.net