Vulcan
Vulcans are a humanoid species in the fictional Star Trek universe who hail from the planet Vulcan, and are noted for their attempt to live by reason and logic with no interference from emotion. On early Star Trek original series (TOS) episodes, they were sometimes referred to as "Vulcanians". They were the first extraterrestrial species encountered by Humans, and later became one of the founding members of the United Federation of Planets. Vulcans are featured in all six Star Trek series, four of which featured a Vulcan as a main character.