The Titans' Orb is a magical stone created by the Titans of Harmony to protect Equestria from otherworldly threats. After a demigod from Tartarus breaks loose, the Orb is stolen and transported to Planet Earth, where it shatters into six pieces, scattering across the globe. The Mane Six are ordered by Princess Celestia to retrieve it at once, for all of Equus is now in grave danger.

Meanwhile on Earth, there lives a boy named Callum, recently fatherless and enduring the torment of an abusive family. He is soon to discover that the fictional characters from his beloved T.V show, are not so fictional.
Alongside his new-found companions, he is soon to embark upon the greatest adventure on Earth.
To find The Titans' Orb.