As I've come to realize, if you want something badly enough, you'll make an effort, but if you care little enough, you'll instead make an excuse. For all its flaws, G4 has the best ending.
When Twilight Sparkles from alternate dimensions begin popping up in Equestria, it is up to Scootaloo to round them all up and find a way to send them home and retrieve her world's Twilight.