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Spark Visions of Twilight: Chapter 9 - Entering Release Cycle
With a plan of action now in place, the rebels set out in a two-pronged effort. Rainbow Dash, Pinkie Pie, Rarity, Twilight Sparkle and Applejack are all en route to Nightmare Moon's castle in the Everfree Forest while an assault is launched within Canterlot as a distraction.

Not all goes according to plan, however, as the train is suddenly pulled to a stop...