Spike learns from Magnum, Rarity's father, that she loves mustaches. So in order to impress the one he loves most, Spike sets off on a quest of epic proportion, meeting every mustached character in the series so far! Whether its under the teachings of Steven Magnet or a showdown with the FlimFlam brothers, Spike will do whatever it takes to reach the lost spring and obtain the greatest mustache of all time!
Just a note: I am taking some ridiculous liberties with character like the The Dude Lebowski, as well as others.