Iris thinks the Desolation has returned! And the little sisters are missing! The Desolation drains the color from Rainbow World and turns friends into enemies. In order to fight it off, the girls have to find the Original Shimmers at the Crystal Palace. Can Skyler, Violet, Bella and Amaya get to the Original Shimmers and bring them back to Rainbow High to save their little sisters and Rainbow World before it's too late?