A thought monster is an all knowing being that can possibly read the future. I takes form of a brain with one eye, and a brain stem for support and mobility. It is a synecdoche of intelligence, foresight, and actually possessing mental telepathy as recorded on the DOI sheet for Dolores. However they still seem to suffer from problems of those far less intelligent such as marital problems shown in the episode Sympathy for the Devil. They show affection by "locking stems."

Great Brain
Another example, pictured to the right is Great Brain, another thought-monster and fiancé of Dolores.

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