Star Trek/T

Talos IV
Talos IV is an M-class planet and the fourth planet in the Talos Star Group. It is located in the third quadrant of the vernal galaxy region of the Milky Way Galaxy. The dominant life form on the planet are a race of sentient, telepathic beings known as the Talosians. In 2254, the crew of the Enterprise encountered a radio signal originating from the fourth planet in the Talos system. The ship's captain, Christopher Pike, believed that he had found evidence of a survey ship known as the SS Columbia, which disappeared in the area in 2236. Pike led a six-member landing party to Talos IV where they encountered what they believed to be the survivors of the Columbia expedition. Pike soon discovered however that the planet's dominant life forms, the Talosians, had merely created the illusion in his mind that he was speaking with members of the Columbia crew.

Talosians
The Talosians were a sentient extraterrestrial humanoid race and the dominant species of the M-class planet Talos IV. They were telepathic beings of great intelligence with brains three times the size of a normal human. Although they still possessed the ability to speak through conventional means, they generally opted to communicate telepathically with one another. They also had the ability to transmit and receive telepathic messages with non-telepathic life forms over great distances, even across the reaches of outer space. Another application of their psionic talent was the ability to generate illusions in the minds of others; illusions so realistic that the subject often could not determine what was real and what was being transmitted into his head. Though powerful, Talosians cannot mentally control others to do anything against their will, but through subtle mental manipulation, they can nudge their targets into committing specified tasks. To facilitate their goals, Talosians use a merit system with those they commune with. "Wrong thinking" would result in images of great pain and torment while "Right Thinking" was just as quickly rewarded with images of the subject's wildest fantasies. Base, primitive emotions were difficult to perceive however. Thoughts of rage and hate mentally blinded Talosians, leaving them vulnerable.