Princess Celestia sends her star pupil, the bookish unicorn Twilight Sparkle, to Ponyville to improve her socialisation skills. Twilight quickly makes five new four-legged friends: Applejack, Rainbow Dash, Pinkie Pie, Fluttershy and Rarity.
Now that she is a Princess, Twilight Sparkle has an important new role to play in the Summer Sun Celebration.(S4, ep 1)
The Everfree Forest is threatening to take over all of Equestria. (S4, ep 2)
When the latest book in the Daring Do series is delayed, Rainbow Dash and friends decide to offer their help to the author. (S4, ep 4)
The Cutie Mark Crusaders vie for the honour of carrying the Ponyville flag at the Equestria Games. (S4, ep 5)
Spike and the Mane 6 end up as superheroes in a comic book world. The only way to get back is to defeat the supervillain. (S4, ep 6)
Vampire Fruit Bats take over Sweet Apple Acres, and Applejack and her friends' efforts to get rid of them take an unexpected turn. (S4, ep 7)
Rarity goes to Manehattan for Fashion Week and loses her sense of generosity. (S4, ep 8)
Twilight is looking forward to some quality bonding time with Princess Cadance. (S4, ep 12)
Pinkie Pie finds her status as a 'super-duper party pony' in jeopardy. (S4, ep 11)
When a member of the singing group the Ponytones has to drop out of a performance, Fluttershy takes drastic measures. (S4, ep 14)
The Cutie Mark Crusaders are thrilled when Twilight offers to help them with their studies. (S4, ep 15)
When Breezies get into trouble while making their migration home, Fluttershy swoops in to save them. (S4, ep 16)
Apple Bloom stays at home alone for the day, but a series of accidents causes Applejack to regret her decision. (S4, ep 17)
Pinkie Pie's sister Maud is coming to Ponyville, and Pinkie Pie can't wait for her friends and sister to meet. (S4, ep 19)
A miracle, cure-all tonic has Ponyville ponies eager to spend their money for a chance to be rid of their ailments. (S4, ep 21)
Rainbow Dash is preparing to take her test on the history of the Wonderbolts. (S4, ep 22)
Trade Ya: Spike and the Mane 6 are headed to the Rainbow Falls Traders Exchange, each with their sights set on trading something. (S4, ep 18)
Rarity loses her creative mojo and feels like she may never be able to create again. (S4, ep 23)
When a villain escapes Tartarus, Princess Celestia chooses Discord to help track him down instead of Princess Twilight. (S4, ep 25)
To protect their magic, Princess Celestia, Princess Luna and Princess Cadance transfer their magical power to Twilight. (S4, ep 26)