Year after year, Crystal Prep's Shadowbolts have won the Friendship Games, an inter-school competition. This year, however, Sunset Shimmer, Rainbow Dash, Pinkie Pie, and the rest of the girls are ready to win!

When a new competitor takes the field, the girls are thrown off guard. And not just because she's been stealing their hair. This girl bears a strong resemblance to one of their best friends, and she's planning something sinister.
(Thanks to Tennis Match Fan for help with the synopses!)