Although the title would imply Pluto was the one responsible for the anime’s conflict, it is revealed that Dr. Goji, another robot made by Tenma, is the one responsible. Prior to the war, human ...

Pluto's orbit (seen here in yellow) is highly inclined and actually ducks inside Neptune's orbit. (Image credit: NASA) It's Jupiter, and to a lesser degree Saturn, that come to Pluto's rescue.