For 3 days, Twilight has been depressed. Her friends don't understand why, and even Spike himself is equally clueless. As they try to find out, they get an invite to a wedding for Twilight's brother. But before even that, something strange happened. A mysterious grey pony appears out of nowhere! Does this pony have the cure for Twilight's depression? And who is this strange pony in the first place? Find out, in A Canterlot Wedding: The Story of the Alternate Path!