Remember when South Park did Crab People?

"The Crab people are evil creatures whose intention is world domination, which they seek through the manipulation and corruption of mankind. They are also a highly intelligent and advanced species, being able to cunningly trick humans into believing their various schemes and fads, allowing them to destroy societies. They are also rather elaborate and extravagant in nature, often enjoying ritualistic chanting and taking great pleasure and enjoyment in the sly art of impersonating humans and their behaviors."

also they live underground