The Night of the Falling Skies. A rare event in the land of Equestria where several hundred thousand meteors grace the night sky for one lone night; a once in a lifetime sight. On her return trip to Canterlot from the Zebrarian capital city, Princess Cadance and her guards have the perfect, unobscured view of of the Falling Skies, not a cloud in sight and no light pollution to steal away the perfect view.
However, a single light in the sky falls to the earth below, startlingly close to where Cadance and her guards had made their camp. Excited at the possibility of seeing a meteorite up close, especially one from the famous Night of the Falling Skies, Cadance immediately goes off to investigate, ignoring the pleas of her guards to let them investigate.
To her disbelief and amazement, what she found instead of a meteorite was a metallic object, much like the ones from her favorite science fiction stories. A ship from another world has crash landed, and bringing with it three of the most wanted pirates from another galaxy.