A letter was sent to Twilight from her mentor, asking to help a researcher. She gladly accepted.
Few days later, she receives another mail, telling her that tonight the researcher will visit Ponyville.
This simple event may change her and her surroundings.

*This thoroughly ignores the last episode of Season 3*
*More characters pending. Will add as the story progresses*
*May include lot's of OOC and Headcanons*