When Twilight's portals release Tirek into the human world and the humans get turned into ponies, they have to unite with their ponyselves to defeat him and save both world's.
Sunny Flare gets her first report card of Principal Cadance's tenure, and it's not good. Her mother, former-Principal Abacus Cinch, has an uncomfortable explanation for that.
Three Shadowbolts on the eve of graduation start a podcast about magical disasters – a conceptual crossover with Well There's Your Problem, a podcast about engineering disasters.
In an alternate timeline, somepony else got to the Mirror Portal before Sunset and stole both it and Celestia away. Acting Princess Cadance is willing to give Sunset a second chance, and hopes to have Sunset's help with a matter of national security.
Sunset and her friends lives were peaceful and happy...That was until the Bombs came. Now, Sunset Shimmer and her friends must try everything to survive in The Canterlot Wasteland.
After the friendship games everything returns back to normal at Crystal Prep Academy. However, five students seem influenced by the spirit of friendship they witnessed at CHS, and are unwilling to go back to the cold-hearted usual of their school.