Everyone in Equestria and beyond know that Celestia and Luna guide the Moon and Sun across the sky. But what about the other celestial bodies?

Are the other planets sentient? Do they have special ponies that guide them across the sky? Where did they come from? Does Luna control them? Twilight Sparkle is determined to figure it out.

After a certain purple filly goes to bed without her dessert, Agent Twilight Sparkle is determined to get back what was stolen from her with the help of her assistant, Agent Spike. Join our heroes as they traverse the dangers of Canterlot Castle to take back what is theirs!