A routine medical procedure reveals a previously unknown link between the King of the Changelings and the Prince of the Crystal Empire. With this knowledge now revealed to them both, will they find a way to contend with the change?
In Equestria, harmony stands strong, and love is in the air! But disharmony also lives on, as a new villain rises with destructive motives. They'll all learn the hard way that ones greatest enemy is their inner demons.
Equestria faces its most dire threat yet as Grogar and his legions march upon Canterlot. Meanwhile, Cozy Glow, Chrysalis, and Tirek prepare to betray him and seize power themselves. Can the Mane 6 save Equestria?
Under the light of the moon, King Thorax and Prince Pharynx come face to face with the changeling's grim past - a dark crown, and the beast that still wears it.
For Neon Dream, life couldn't be simpler. That is, until a stranger appears, begging for help. Now she finds herself pursued by relentless mercenaries and authorities alike as the darkest secret of Ponyopolis is about to be revealed...