Twilight has been called off to a mission by both Celestia and Luna. When she gets there, she learns that something happened in the past that was never recorded. It never made it to any of the history books, leaving only the Princesses to know what happened and what needed to be done. They both knew this day would come eventually, and neither of liked it, but they had to do it, if only because Twilight warned them about it almost a millennia and a half ago.

Based on the 2011 movie Captain America: The First Avenger.