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.