What I had in mind; the cast is Twilight, Spike, Rarity, Luna and Nightmare Moon... or just the Nightmare (maybe). The premise is either Twilight, Spike or Rarity are kidnapped; Twilight being kidnapped, Spike and Rarity go after her with a slowly-building romance. If Rarity is kidnapped, Spike and Twilight go after her with Spike determined fully, or Spike is kidnapped and Rarity and Twilight go after him. Luna goes simply because the stars are her thing... but yeah. Either way, someone gets kidnapped, and the one that makes the most sense is Rarity or Spike getting kidnapped since Twilight would make a spaceship. Twi getting kidnapped would simply allow for my #1 ship, Sparity, to build up.