This is how Prologue: Plasmius arrives goes in Vlad Plasmius' Revenge.
[The film opens in Equestria, in the outskirts of Ponyville]
Vlad Plasmius: At last. The end of my quest: Equestria.
[Vlad looks at Twilight's castle, flies to it, looks in through a window and sees Twilight]
Vlad Plasmius: Well, well, well. Who do we have here?
Twilight Sparkle: Hi, Applejack.
Applejack: Twi, there's somethin' we need to talk about.
[They leave, unaware Vlad is watching]
Vlad Plasmius: Hmmm. An alicorn princess. She could be of use.