If there is anyone here who doesn't watch the ponies you don't know what you are missing.http://www.youtube.com/watch?v=bqrphKVjjO0 - Try it, you never know. (to explain the start the purple pony (Twilight Sparkle) became an Alicorn and gained wings at the end of the previous series)
This season everyponies eyes are rainbowing, and there is a search for the keys to the box from the tree of harmony,
That said this hasn't been mentioned for a fair number of episodes...
So far this series:
1 "Princess Twilight Sparkle" (Part 1) Twilight learns to fly, Princess Luna and Princess Celestia disappear, the Everfree forest expands, Twilight sees the past
2 "Princess Twilight Sparkle" (Part 2) Twilight sees more of the past, the jewels of harmony are put back in their home, the Everfree forest retreats, Luna and Celestia are rescued, and a chest with six keyholes and no keys is found.
3 "Castle Mane-ia" A great episode, Twilight and spike go to Luna and Celestias old castle to look at the library, Rarity, Fluttershy and Angel bunny go to the castle to "rescue" materials, Applejack and Rainbow Dash are still trying to prove who is the most macho and decide that whoever stays in the old castle where the "Pony of Shadows" lives wins, much high jinks and hilarity ensues.
4 "Daring Don't" A Rainbow Dash story, bit of a waste IMNSHO but if you didn't have the odd duff episode you couldn't really appreciate the high standard of the vast majority.
5 "Flight to the Finish" A Cutiemark Crusaders episode, the schoolponies are offered the opportunity to carry the Ponyville flag at the Equestria games, the team that produces the best skit wins, Diamond Tiara and Silver Spoon make Scootaloo paranoid, will the CMC win?
6 "Power Ponies" ZAP Rainbow Crash gets struck by lightning, WHAMM Twilight fires fire and ice from her horn, KAPOW Fluttershy becomes the incredible Hulk, BOFF Rarity uses her design skills, KLONK Applejack gets into bondage, ZOWIE Pinky Pie travels even faster than normal, YAWN Spike is useless. Fun, fun, fun.
7 "Bats!" OK I didn't understand this one at all, if you leave the bats alone they wont eat everything like they are doing? Although the monster was cool.
8 "Rarity Takes Manehattan" Is there anything better than a Rarity episode? Rarity enters a design competition in Manehattan and takes the Mane 6 with her, arranging for them to see Hinny of the Hills a sold out musical, she meets Suri Polomare who left Ponyville years ago and who takes advantage of Rarity's generosity, will Rarity win the competition? Will she lost her friends? A roller-coaster ride.
9 "Pinkie Apple Pie" Twilight shows Pinkamena Diane Pie an old genealogical text, and in a difficult to read area Pinky believes that it shows that the Pies and the Apples are related, Pinky and the Apple family go on a road trip to visit Goldie Delicious who is the expert on their family history.
10 "Rainbow Falls" Rainbow Crash, Fluttershy and Bulk Biceps are competing as a relay team to take part in the Equestria games, Rainbow Dash (whose element is loyalty) once again bales on the team to fly with the Wonderbolts, and is replaced by Derpy Hooves
sadly Derpy gets the heave ho when Rainbow Dash comes to her senses
11 "Three's a Crowd" Discord! Cadence! Influenza! A trip to the edge of the realm! But most of all Discord!
12 "Pinkie Pride" There's a new party pony in town,"Weird Al" Yankovic Cheese Sandwich arrives in town and offers to help plan Rainbow Crashes birth-iversary party, Pinky Pie feels overlooked.
13 "Simple Ways" Rarity is chosen to be Master of Ceremonies for the Ponyville Days Festival, her crush travel writer Trenderhoof arrives and falls in love with Applejack, Rarity tries to out country the earth pony which leads to the appearance of Applejewel...
14 "Filli Vanilli" Top Title! The gang discover that Fluttershy can sing and Rarity wants her to join the Ponytones, but Fluttershy suffers from stage-fright. When Big Mac loses his voice in a turkey calling competition Zacora suggests that they turn Fluttershy into Flutterguy ala the poison joke. Fluttershy sings for Big Mac whilst being hidden from the audience by various entertaining mechanisms.