Pluto

Pluto is a planet of the Terran Solar System in Ultima II that can be visited with the rocket ship in the time of the Aftermath. Minax' meddling with the timestream had caused the planet to be quite different from its original state.

For being the outermost planet of the system, Pluto is quite crowded; apart from the pirate village "Tommersville," there also is "Towne Makler" and a dungeon. The mountainous terrain found here makes it very tricky to land a rocket, and makes travel between various sections of the planet possible only with bi-planes.

Pluto is on the space chart of the documentation, and its coordinates are 0,1,4.

Trivia

 * In reality, the planet is frozen solid, practically a huge ice-cube in space.
 * Pluto was reclassified as a "dwarf planet" in 2006 when the IAU officially defined the term "planet" for the first time -- a definition which technically excluded Pluto, leading to its current classification.