In one world, Twilight married Captain Flash Sentry. In another, she married none other than Discord. Both had kids. Both have now been kidnapped. This will not end well.
It can be hard being a draconequus, especially when you have to behave yourself during your perfect (read: obnoxious) cousin is getting married. It can be even harder after you may or may not have gotten her kidnapped.
For career outcasts like Cupcake and Pandora, any sort of contest can be something of a foregone conclusion. And yet, every year, Cupcake enters the Annual Canterlot Bake-Off in the vain hope she will finally win.
The Pandoraverse is a lovely universe where Pandora, the supreme offspring of a loving Discord and Twilight, is the best organism to grace the multiverse. The Paradoxverse is just the same, but everyone is the opposite gender. And Paradox laid a egg.