Robert Deschaines was a psychic. During his funeral, it was discovered that his head was removed. This happened the same week with Max Shea's disappearance.
His brain was cloned and augmented and was the essential part of the Alien Monster's attributes.
It has been pointed out that, since his psychic powers were apparently genuine, Deschaines was the only character in the Watchmen universe other than Doctor Manhattan confirmed to have paranormal powers.