On secret assignment from Princess Celestia herself, Twilight investigates a powerful magical artifact for clues to the mystery of Luna's transformation in the evil Nightmare Moon. Incautious use of the artifact sends Twilight hurtling back in time. Can Twilight discover what caused Luna's transformation? And will she ever make it home again?

Kickass cover art used with permission from Bitz.
http://allthebitz.tumblr.com/

While out hiking in the mountains near Ponyville, Big Mac discovers a mysterious staff which grants him the power of the ancient god Thor. Old myths awaken, new legends are born, and one simple farm pony is thrust in the middle - as the leader of Celestia's newest crime-fighting force, The Avengers! A fusion fic with Marvel Universe, mostly Avengers.