In one world, A Princess Falls and the Queen need to stop her younger sister, an in other the Queen Falls and the Princess needs to stop her older sister. Both take same route that go a Queendom to isolation when a mad doctor takes a neighbour Kingdom but different reasons and The Fallen Ruler Returns and the Queen send her apprentice to prevent a Crisis. Six Champions saves the Queendom and becomes the Heroes. When The Super Genesis Wave is activated and worlds are in perill as New Evils and Old Evils Rises using 7 sources of Energy, one Hero cuts in half one of sources and is the Gems of Harmony and the two worlds become one with changes as 12 Chanpions (two are sharing one gem) and now the defends the world with heroes old and new. Is Brand New World!
Edit: The Gals replace the non-champions version of them, they were deleted as the history of them was replace as Celestia and Luna but The Queen and The Princess have their dark side of Daybreak and Nightmare Moon seal it inside of them.