Chritchellite

Chritchellites are diminutive beings that appeared in the 4th episode of Samurai Jack.

Overview
These creatures appeared to be short blue skinned individuals with white space suits with visor glasses attached which vary depends in their rank. Their technology was so sophisticated, they enslaved the entire sapient species of Woolies for years, treating them harshly like animals and builders. Not until Jack came and learn that the Chritchellites were abusive towards the poor mammals, so Jack fought the blue beings and freed the Woolies.