During Canterlot's Familial Day, Shadow starts to contemplate his connection with the Black Arms race he defeated. However, Eclipse the Darkling, his 'brother', manages to escape from G.U.N custody and captures Shadow to brainwash him into serving the Black Arms once more. As a result, the two of them head off to Planet Wisp in order to conquer it and cultivate their species once more. With Shadow gone, it's up to his friends and Team Dark to bring him back to his former senses and remind him where he truly belongs.