One day, something terrible and unexpected happens to Celestia, and time is lost to the sands. She'll find that her entire world is gone and that almost everything she knew and loved has disappeared...forever.
Obsessed with changing the past, Snails has almost completed his ultimate invention: a time machine. Will Snails be able figure out the cause of the disaster and save his friends before it's too late, or is history doomed to repeat itself?
In a desperate attempt to thwart the plans of a power-hungry sorceror, Twilight Sparkle ends up displaced ten years into the future, only to find that everything turned out all right. She could go back, but all is well that ends well! Right?
A forty-one-year-old Twilight Sparkle causes a chain reaction of temporal problems when she travels through time as her last hope for answering her vast questions about who she is and where she belongs in the universe.