Brain Slugs (born Brain Slugs) - are small, fist-sized, translucent one-eyed alien creatures of a fluorescent green color. They try to get on the head of a person and, when they succeed, begin to fully control him. As soon as the slug is removed from the head, the person instantly returns to his normal state.
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In addition to the presence of a brain slug on the head, the person affected by the slug gives a monotonous voice and an indication of himself in the third person. Having gained control over a person, the brain slime tries to control it in such a way as to extend the representatives of its own species to the maximum number of possible victims. Those who were affected by the brain slug even organized their own political party, the main program of which was huge remittances to the planet of the Brain Slugs and the universal infection of all people.
Source: List of Futurama characters that appear periodically (Wikipedia)
Source: https://habr.com/ru/post/44462/