Pluto's back, and it's pissed...

Starting in 2115 George and Neal started sending weekly weight gain supplements and steroids to the Dwarf Planet Pluto. By 2194 Pluto had gained enough mass to achieve orbital dominance, thus re-establishing it in its rightful place as the 9th Planet of the solar system. 

Unfortunately, Pluto's not quite so polite method of clearing its orbit, and the eventual battery of its moon Charon (and resulting restraining order) caused the rest of the Solar System's objects to hold an intervention and ultimately send Pluto to a rehab facility. 

In 2238 Pluto returned to the Solar System clean and friendly, though substantially less massive. Pluto was able to remain docile and still retain enough mass to keep its status as a full fledged planet through a healthy regimen of diet and exercise.