Twilight Sparkle and her friends receive a distress call from Canterlot. The city is under attack by a huge monster. Twilight fights bravely and has to pay a heavy price... An emotional journey in which friendship is put to a new test and an adventure that leads beyond the borders of Equestria to the horizon, where Celestia's powers no longer play a role.

Suddenly Apple Bloom finds herself on the moon. She was banished, accidentally. Now she has to deal with it somehow.