After being left behind in the badlands after her expedition is attacked by a dangerous monster, Twilight Sparkle must survive a hostile, alien environment. Lucky for her, she has some help from one of the natives: A curious changeling named Thorax.
What does it mean to be a Changeling? To the former human Prince Phasma, that means doing what you can to survive and thrive in an utterly alien world.
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.
Chrysalis has been sent packing, but Twilight is no fool, and pursues. But in doing so, she discovers a hidden side to the queen that leaves her very surprised.
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.
Princess Cadence and Prince-Captain Shining Armor have given Thorax a journal to document his days in the Crystal Empire so they can help him learn from his experiences. This can only go well.
When the days draw short and the nights grow long, the line between friend and foe becomes harder to see. The formerly-human King Phasma must stand strong with his friends against the encroaching dark.
During a liaison visit between his hive and the Crystal Empire, a young changeling drops by a local plushie shop to pick up a special order. He never expected the plush maker to be a changeling, too.
Embracing the power to share love rather than steal it, the changelings work to reinvent themselves and their kingdom while Thorax seeks to introduce a more peaceful hive to Equestria.
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?
Spike has a problem regarding inviting two of his royal friends over on the same day! To avoid a diplomatic disaster, can Twilight, Starlight, and Spike prevent these two from meeting? No. No, they can’t. Let’s move on to the real problem.
Chrysalis has been doing well in looking forward, but she is asked by Celestia to look back one last time in hopes of bringing resolution to her still bitter relationship with Cadence and Shining Armor.
After the Alicorn Amulet is stolen, Starlight and Rainbow Dash gather some friends to steal it back. There's no one way to plan a heist, but pulling it out of your butt and fumbling your way through the whole thing seems to work.
The entire course of history can be changed by a single butterfly flapping its wings. So what if an entire war was won instead of lost? What if a King never existed?
In volume 3 of the Flash Sentry Papers, it's up to Flash Sentry and Special Agent Golden Harvest to save Equestria from another Changeling invasion ... whether Flash likes it or not.
The changelings are no longer creatures of violence. They are no longer shady, private, hostile and fierce. They no longer are the acting steel hoof of Chrysalis' will. Time has changed them, and to Pharynx, it has changed them for the worse.
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.
Sometimes, when one is dealing with family problems, it's best to get away and cool off. What better way for Thorax to do that than spend time with his best friend and the stallion he swears is the definition of cool?