After the Elements of Harmony are rediscovered, Celestia decides to restart a policy for rehabilitating dangerous criminals. Twilight and her friends must journey into metaphorical hell and back to fix these poor ponies that deserve to be there.

When Twilight is sent to observe human culture, a very much unknown subject, how will she react to a lifestyle and culture so similar but different from her's?

When six humans that literallly represent the darkness of man, how will the ponies react to such evil, cruel creatures?