The solar system is being spring cleaned. Under the supervision of celebrity planetary make-over decoratiste Arisotle Halcyon, the number of moons of Jupiter is being brought down to an aesthetically pleasing level. But with eco-terrorists taking an active - and deadly - interest in the work, corrupt officials lining their own pockets, and incompetence leading to the demolition of the wrong moon, the Doctor and his companions realize that not everything as is aesthetic and innocent as it seems.

Will the Doctor be able to stop dangerous experiments in genetic engineering and overturn a clandestine evil plan to conquer the solar system? Will Trix escape from the deadly space sheep? And will Fitz become the galaxy's next megastar designer on the future equivalent of "Changing Planets?"