Shocked by the raid on Equestrias colony on the planet of Horizon, Shetland Sparkle must learn to live with those she lost. But when investigators of the Hyena Empire arrive, it seems that something sinister is happening behind the scenes.
Humanity's space exploration ultimately took the form of billions of identical probes, capable of building anything (including astronauts themselves) upon arrival at their destinations. One lands in Equestria. Things go downhill from there.