DJ appears in Equestria five years before the events of season one start. On the day of nightmare moon's return, he travels into Ponyville for the some potion ingredients Zecora needed at the time. When Twilight meets him she decides to study him, and misses the raising of the sun ceremony in the process. When DJ accompanies the girls through the Everfree to gather the elements of harmony, the whole universe is set on a different, yet similar path.
NOTE: This story is set in an alternate universe, so I will do my best to make sure all characters will be introduced. I'm going to be writing almost a new story line because of this, but I will make sure to include all of the major villains and unique experiences the best i can.