When Principal Celestia suggests to Princess Twilight that she assign a representative in the inevitable event that the government takes an interest in a portal to another world on her school's campus, Twilight sends a mare with lots of experience traveling and dealing with beings of all stripes, plus the ego to keep from being cowed by agents of a foreign government. Besides, Trixie could use a...third chance, after all.
Meanwhile, the student Trixie is being disciplined. Her punishment? Escorting a new student around the school for at least 30 days. That student? Twilight Sparkle, new transfer from Crystal Prep.