As a way to say thank you for inviting Starlight to the human world, the unicorn offers Sunset Shimmer a chance to visit Equestria. Her visit may not be as eventful as the last two times, but she's still met with meeting leaders of other countries, dealing with a giant monster and a bad tempered changeling, and finally getting the biggest surprise of all time from her family.
Follows along in the timeline of Sunset's Redemption, Sunset's Hearth's Warming and other stories in my fan-made MLP series.