Everypony knows the story of the 'Mare in the Moon'; Younger sister jealous of older sister, blah blah blah- banished for a thousand years blah blah blah!

Prophecy states that on the longest day of the thousandth year, the stars would aid in her escape and she'd be unleashed on the world once more, but what nopony really knows is how these stars would aid in her escape, and what caused them to go to the moon.

This is the story of the four 'stars' that went to the moon, and Nightmare Moon's escape from her prison.