Discord's power was something that always frustrated Twilight. All that power, with no effort, no cost. So when Discord offers her a chance to learn his secrets, Twilight quickly agrees. Unfortunatly all things come with a price.
During Equestria's annual royal summit, newly-met Shining Armor and Pharynx discover they have a fair bit in common, including a passion for homeland security, and an extremely dorky little brother/sister.
When Apple Bloom goes missing, Applejack desperately searches for her missing sister. She finds Apple Bloom trapped inside a well. But what she pulls out may not be her sister at all.
Twilight has theorized the possibility of creating pocket dimensions. Facing the ridicule of the theoretical magic community she has set forth to prove them wrong. She constructs a portal and enters it. Inside, she finds a field of empty white.
Atop Chrysalis's decimated hive, King Thorax confronts his former peers. When their discussions are interrupted by a confused and scared changeling nymph, Thorax demonstrates the power of sharing love between changelings.
Despite their detached relationship, Thorax never gave up on his brother. With Pharynx now transformed, his cold demeanor has begun to thaw, and so Thorax is presented with something he's never had, before - an interactive big brother.