Pinkie Pie and Rainbow Dash bond over playing pranks on the other ponies until Rainbow's old friend Gilda the Griffon shows up for a visit. Pinkie Pie, feeling left out, desperately wants to play with Rainbow again. She soon notices that Gilda doesn't just play pranks, but can be downright mean to the other ponies. Pinkie Pie sets up a party to test who exactly is Rainbow Dash's true friend.
"Get your muzzle out of those books and make some friends!" That's what Princess Celestia tells Twilight Sparkle. She may be the smartest unicorn in Equestria, but Twilight Sparkle gets an "incomplete" in friendship. There's more to life than learning magic, after all - so she goes to Ponyville on a mission to make friends. There she meets five special ponies who take her on exciting adventures and teach her the most powerful magic of all... the magic of friendship!