Due to spacetime manipulation, Princess Luna, Lyra, the Mane 6, and Queen Chrysalis go to Earth. Half of them are turned into cars. Guest starring zombie Johnny Cash.
When the Bearers race forth from Ponyville on an official mission, somepony has to take over on their day jobs. For Fluttershy, that's usually Snowflake. But he's not available today, so it's going to be a Sherman tank.