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 needs more friendship. There's more to life than learning magic, so she goes to Ponyville on a mission to make friends.
When Pinkie Pie thinks she sees Rainbow Dash throw away one of her pies, she suspects the worst - that Rainbow Dash secretly hates her pies; Pinkie Pie attempts to catch Rainbow Dash in her web of lies.