Sirius B Alien

Sirius B aliens were (former) villains that appeared in the cartoon series "Mighty Max". These short bird-like aliens visited the Dogon tribe of Africa generations ago. After returning, they granted the Dogon shaman, Nahmo, superhuman abilities and set about stealing the "ultimate source of power" from Earth's power plants - toxic waste. Max and his friends attempted to stop them until Max learned what it was they were stealing, after which he tricked the aliens somewhat by "negotiating" a peace treaty in which the aliens would leave Earth alone but take all of the toxic waste they wanted.

However, when they get to be introduced to real life Earth, they do meet the real Dogon tribe, and formed a new nation called Siriusia. Also, they don't need unneccessary toxic waste anymore.