Quantum Gallop

Five of the youth of House Path are abruptly whisked away by the enigmatic Doctor Whooves, and they find themselves in a Ponyville that they can scarcely recognize. A tyrant queen rules Equestria, alliances were never forged with Griffonia and the Changeling Hives, and three of the group had never been born! Someone has changed history and it is up to them to figure out when, how, and who did it, otherwise Equestria will suffer along with the rest of the world.
Third in the "Chrysalis Resurgent" series - this story is the sequel to "A Different Perspective" and "The Growing Years".