Twilight's fiasco with Cerberus leaves her stuck with the gaurdian of the Gates of Tartarus. Now, she is in a race against time to save Ponyville from what Future Twilight had told her as well as being hunted by bounty hunters and a Brotherhood who will stop at nothing to destroy the subjects who defiled their sanctity.

A lost civilization, time travel, and an undying struggle to save Ponyville from an event that might not even happen, Twilight will go on a journey that will change her life and the way she looks at ponies who are considered 'good' and those who are 'evil'.

This story is also known as "To Tartarus and Back Again".