Prophesy says that Twilight Sparkle will not outlive her friends. To preserve the Princess, her friends must survive. They may not be immortal - but one year can become a thousand at the speed of light.
Twilight has theorized the possibility of creating pocket dimensions. Facing the ridicule of the theoretical magic community she has set forth to prove them wrong. She constructs a portal and enters it. Inside, she finds a field of empty white.
A particularly stubborn human is lost in Equestria and is trying his damnedest to find a way out, while surviving the surprisingly difficult rigours of life in a land filled with cute talking animals. Hilarity ensues.
Humanity has fallen, and the ponies are left to mourn their loss. Fortunately, there's one thing they've all forgotten: you can't keep a good apex predator down.
A shattered and broken soul, Spike has spent the better part of the last two thousand years in never ending battle in the dead world of Ginun. Now, he must return to Equestria to protect what is most precious to him, but also face his shame again.