Rainbow Dash has always struggled with the idea that she needs to be the best, and when a new and mysterious pony comes to town to compete in the annual series of race events, she can't help but feel threatened that some other pony may be able to compete against her. Who is this mysterious pony and what is this pony doing in Ponyville? Will this new pony be able to beat the undefeated Rainbow Dash? More importantly, would Rainbow Dash be ok with losing?