Luna crashes into Ponyville, and goes into a coma. The mane six, the CMC, and Celestia all show up. As Luna is violently kicking, they know something is not right with Luna. Celestia knows, but can't bring herself to tell everypony. Meanwhile, Luna is reliving her past from before she was the Mare in the Moon. This secret can be kept no longer. And Celestia can't hide it forever.