The Main 6 decided to enter the Canterlot Cup, an all year round racing series which involves mechanical machines which have over 600PonyPower. The Machines are known as Stock Carts, and can go as fast as 200MPH, but when they arrive at the first circuit of the season they spot Discord and his team of evil minions. Will the main 6 win or will Discord clench the title of Canterlot 500 Legend.