A Cozy Glow-hating brony is fooled by the nefarious filly herself into switching bodies, now he's the one locked in Tartarus while she's causing havoc in his world. Uh-oh. Also, nopony believes him... because he's Cozy Glow. Makes perfect sense.
Trouble is brewing. Either Starlight gets to the bottom of it in time, or she could lose Trixie as a friend... Or worse yet, she could lose two friends at once.
Starlight Glimmer winds up having the craziest dream one night, a dream involving an argument over who Starlight's biggest fan loves the most among multiple ponies.
After her brother and Sugar Belle get together, Applejack decides it's finally time to give this whole "relationship" business a shot. Only problem is, she's gonna need a bigger mailbox...
When Starlight Glimmer becomes sick before Hearth Warming's Eve, Trixie has to face the reality of spending the holiday alone. Will Twilight and the others be able to help Trixie have a "Great and Powerful" Hearth's Warming?
Twilight's efforts to guide Equestria into a new era of peace and harmony are constantly interrupted by Starlight, who keeps popping up randomly at the most inconvenient moments. It happens a lot, put it that way.
Trixie has finally gathered enough courage to ask Starlight to marry her, so she asks Sunburst to choose a ring for her proposal. However, Starlight has other plans in mind.
The mysterious Table of Harmony has called on Starlight Glimmer to solve a friendship problem at Canterlot Castle, but wait! A second cutie mark belonging to a magically inclined alicorn has appeared, and unfortunately for Twilight, it’s not hers.
Lord Tirek, Queen Chrysalis, Grogar, and Empress Cozy Glow have begun their invasion. Thanks to a stupid decision by the Mane 6, Equestria's only hope lies in Starlight Glimmer. Equestria's doomed, right? Uh, about that...
Starlight Glimmer has gotten her hooves on Twilight Sparkle's Friendship Journal. And a time travel spell. And a Driver. And a bunch of Ridewatches. And she realizes that she could fix everything with time travel and Rider kicks. So she does.
Starlight Glimmer has worked hard to bring about her vision of perfection. Molding ponies to fit where they were supposed to and making them happier for it. Pity no one told her that when they made the Great and Powerful Trixie, they broke the mold.
Twilight Sparkle keeps using a specific phrase out in public to describe her 'special relationship' with her friends. Said friends are convinced it does not mean what Twilight thinks it means.
Twilight wakes up one morning, and she can't say a word. Neither, for that matter, can anypony else. In fact, all the sound in Ponyville seems to have gone overnight. Is there a logical explanation for this? Probably not. An illogical one? Maybe...