When an alien spaceship crashes into Equestria, Twilight Sparkle has to make sure their extra-terrestrial guests feel comfortable and at home, lest they try to raze everything in sight to the ground, while Krr'zal, an alien Commander, has to learn to pull his socks up (figuratively speaking) and properly represent the larger Galactic Community, as well as prevent his crew from running rampant among the ponies, and focus on getting off of what seems like their new permanent home planet.
(Takes place during season 6)