Cadence and Shining Armor visit one of their generals and his wife in the hospital to give their congratulations on the new born foal. However... the visit wasn't as routine as they first thought.
The princesses gave their magic to Twilight to prevent Tirek from stealing it. As a result, they end up stuck in Tartarus. The fact that things manage to go downhill here says a lot about the wonders of family.
Trying to spice up Celestia's love life, Luna signs her up on a dating website. Now Celestia has to go on a series of dates with other immortals. This should end nicely.
Pinkie Pie finds herself adjusting to a new, hostile world, with a new hostile friend. Can they make it through this new misadventure together, or is it the universe that needs to watch out for them?