@kalucion Basically, (lotta spoilers) Sunset Shimmer goes apesh** and kidnaps Spike. And pulls a massive sledgehammer out. Then she gets Twilight's crown and transforms into a monster and destroys half the school and mind controls everyone, (a lot of people probably died at this point) then the magic of friendship saves the day and Flash Sentry asks Twilight to dance and then there's a rave. Twilight goes home and meets Flash Sentry in her own universe, whom she immediately falls in love with. The movie ends at this point.
