When Lex Luthor ends up marooned in Equestria, he decides to run for the throne of Princess against Princess Celestia in order to prove his superiority.

A pair of swindling salesponies, an exploitive talent manager, a brutish dragon, a dishonorably discharged Wonderbolt, a devious doctor and a malevolent beast must take action when an old foe suddenly threatens all of Equestria.