Talosian (mirror)

In the mirror universe, the Talosians were the species native to the planet Talos IV. While physically weak, the Talosian had superior telepathic abilities that allowed them to read minds and create illusions that felt real.

The Talosians encountered Humans for the first time in the early 22nd century when an Earth starship crashed on the surface of their planet. Among the wreakage was one survivor, a woman named Vina. The Talosian eventually lured the ISS Enterprise and intended to have Captain Christopher Pike mate with Vina in order to create a race of Human slaves who could then reclaim the devastated surface of the planet.

However, the Talosians learned of the Terran Empire's fear for telepaths and decided to release Captain Pike who would then act as their eyes and ears within the empire. The Captain would warn the Talosians should the empire ever chose to attack Talos IV. Not only did the Talosians maintain a telepathic link into Pike's mind once he left the planet, they also gave him the ability to create illusions, specifically the ability to maintain his youthful appearance in spite of advancing age and debilitation.

Although Pike had recommended to Imperial Starfleet that Talos IV be quarantined, the Talosians did not trust him and considered the Captain to be weak and unsuitable for their purposes. When Lieutenant Commander James T. Kirk assassinated Pike, the Talosians entered his mind and attempted to use him as their new spy within the empire. In his first action as the new captain of the Enterprise, Kirk ordered the ship to Talos IV while he kept his mind full of savage rage. The thoughts of rage prevented the Talosians from reading his mind.

Upon reaching the planet, Kirk ordered its surface to be leveled, killing the entire Talosian race. (SS TOS (The Greater Good))