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At a first glance, Allen Greathouse is your average, 15-and-a-half year old brony; he watches My Little Pony: Friendship is Magic, he reads fanficiton, and listens to the popular brony artists.
Underneath this seemingly happy exterior, however, he is clinically depressed and has no friends.
After having enough of his endless sadness, he tries to end it all, but a stroke of luck saves him at the last second. Now, he finds himself trapped in Equestria, where he learns the dark history between humans and ponies. His only chance of getting home is proving to Princess Celestia, in one week's time, that humans have changed in the last few thousand years.
With a human arriving in Equestria, ancient defense measures are being reawakened from their slumber to fulfill their sole purpose: Kill any humans at all costs.
Some Notes
Takes place after the two-part premier of Season 4, but it's as if there was no chest beneath the Tree of Harmony.
A young boy attempts to take his own life, but after being unsuccessful in his attempts, he is transported to a world where he learns that maybe life isn't that bad, and friends can be right around the corner.
Allen Greathouse faces his biggest challenge yet when humans breach the boundaries between worlds, which subsequently awakens an ancient and powerful enemy.
Two months after the union of Allen and Luna, Drayke Blackwood is brought back to Equestria to investigate the crystal prince's disappearance.