This race has a strange and complicated history, but it boils
down to this: they are a genetically-engineered race of octopus-
looking beings who ride around in battle armor and relentlessly
kill everyone and everything. They have no emotions, so nothing
stops them from killing in cold blood. The Doctor has supposedly
destroyed them many times, but each time, these crafty mollusks
find a way to come back and wreak more havoc.