Well, some aliens are really nice! Like we have some who are from Kinmoku which is way outside of the Sol system, but then we had aliens from the Tau Nebula who uuuh, basically tried to take over all of Earth by infecting students from elementary all the way up to college with eggs from their system. They were stopped, though. Then there was this really nasty alien from the dark side of the moon, she tried to take over in disguise through a circus. Then we had aliens from the future who tried to change the past before they got exiled to the tenth planet for genocide and murder!

But those are mean aliens! Mercury, Venus, the moon, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto all have really really nice aliens who helped stopped the bad ones!