Rainbow Dash is quite the youthful spirit. She's got boundless energy, a winning attitude, incredible speed and agility that make her one of the fastest ponies in Equestria. Her whole life is ahead of her, her future's looking bright and she's got a dream she's pursuing with all the passion you'd expect from somepony her age. But not even Rainbow Dash is immune to the march of time and she's about to find out exactly how vulnerable she is...