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.
The peace of Equestria is threatened when Discord, spirit of Chaos, escapes from his imprisonment in stone. (S2, ep 1)
Discord's mischief causes a rift between the six friends and renders the Elements of Harmony useless. (S2, ep 2)
Hyper-organised Twilight panics when she can't find a lesson about friendship for her weekly letter to Princess Celestia. (S2, ep 3)
It's Nightmare Night and the macabre celebrations are in full swing when Luna herself shows up in Ponyville. (S2, ep 4)
Sweetie Belle disowns Rarity as her sister when she refuses to participate in a celebration of sisterly unity. (S2, ep 5)
Apple Bloom finally gets her cutie mark! But joy turns to panic as she gets a second, then a third, then a dozen cutie marks. (S2, ep 6)
Rainbow Dash holds a flying race to determine who will win the honour of being her pet. (S2, ep 7)
A new masked avenger is stealing Rainbow Dash's thunder as Ponyville's resident hero. (S2, ep 8)
During a successful trip to Canterlot, Rarity has to choose between the important new friends and her Ponyville friends. (S2, ep 9)
Spike's birthday gifts activate his greedy dragon instincts and cause an outrageous growth spurt. (S2, ep 10)
The six friends put on a play that illustrates how Unicorns, Pegasi and Earth Ponies founded Equestria. (S2, ep 13)
Apple Bloom does everything she can to stop Granny Smith from speaking to her class and causing embarrassment. (S2, ep 11)
Pinkie Pie takes on the task of babysitting the Cakes' twin toddlers, but is woefully unprepared for the challenge. (S2, ep 12)
The friends travel all over Equestria to track down Applejack, who has mysteriously disappeared. (S2, ep 14)
The future of Sweet Apple Acres is in peril when the Apples challenge the Flim Flam brothers. (S2, ep 15)
After mocking it as an 'egghead' pursuit, Rainbow Dash discovers the joys of reading while laid up in Ponyville Hospital. (S2, ep 16)
The Cutie Mark Crusaders create a love potion to make Miss Cheerilee and Big Macintosh fall in love. (S2, ep 17)
Pinkie Pie is flummoxed about what to do when she meets Cranky Doodle Donkey. (S2, ep 18)
After being pushed around too many times, Fluttershy gets some assertiveness training from self-help guru Iron Will. (S2, ep 19)
Twilight drives herself to distraction trying to forestall some future disaster. (S2, ep 20)
Spike goes on a journey of self-discovery by joining the Great Dragon Migration. (S2, ep 21)
Fluttershy struggles to overcome her fear of public humiliation so she can help Rainbow Dash create a tornado. (S2, ep 22)
The Cutie Mark Crusaders adopt the name 'Gabby Gums' to become the gossip columnist for their school paper. (S2, ep 23)
Pinkie Pie starts the silliest criminal investigation in the history of Equestria. (S2, ep 24)
Twilight is confused by her conflicting feelings when she finds out her brother Shining Armour is marrying Mi Amore. (S2, ep 25)
Can Twilight save her brother and all of ponykind by freeing the real Mi Amore and defeating Queen Chrysalis? (S2, ep 26)