Ever wonder why Granny Smith gives Filthy Rich those 100 jars of zap apple jam? Or who her husband is? Or why zebras are treated differently in Ponyville? All the answers are in Granny Smith's private scrapbook.
When a strange pair of alicorns come to visit Twilight Sparkle, she and her friends, as well as a strange groups of Zebras, get a little history on one of the earliest known alicorns, predating even Celestia