Friendship Is Magic (2)

The evil Nightmare Moon is free from her imprisonment, vowing to shroud the world in eternal night, and Princess Celestia has gone missing. Twilight and the other ponies must find six magic stones called the Elements of Harmony, hidden in the mysterious Everfree Forest. Through every obstacle they face leading to the artifacts, Twilight discovers a secret that can unlock the Elements' power and relight the world.
Subtitle: The Elements of Harmony
My Little Pony; Friendship is Magic - Season 1, Song #1: "Giggle at the Ghostie" A. K. A. "The Laughter Song"