Searching through the Everfree forest one afternoon, Rainbow Dash finds a giant pyramid of glass. Yet as she inspects it she gets trapped inside with no way out. When a ray of sunlight strikes the prism, six different personalities are taken out of Rainbow Dash and are able to roam free. Soon Twilight and her friends discover that the separate personalities are all over Ponyville, and if they don't recover all the different colored Rainbow Dashes by sundown; their friend might be gone forever!