The element of magic, Luna, has transformed into Night Mare Moon and been banished to the moon by her fellow element and sister Celestia. But something is happening to the five remaining elements when their connection to their respective elements are lost. Being connected so close to them their very souls and bodies are being twisted into something else.

The universe exploded and then the Doctor fixed it, at the cost of never existing. Now the Doctor finds himself in the TARDIS as it crashes through the fabric of the universe. Once it has landed the Doctor can't believe the scanners when they say he is on his home planet. But all is not as it seems when he opens the door to find a brown pony with an egg timer on its flank.