Convert from English to Vulcan. The Vulcan language was spoken by the Vulcans of the planet Vulcan. Vulcans are a fictional extraterrestrial humanoid species in the Star Trek franchise who originate from the planet Vulcan. In the various Star Trek television series and movies, they are noted for their attempt to live by logic and reason with no interference from emotion. They were the first extraterrestrial species in the Star Trek universe to observe first contact protocol with humans. STAR TREK and related marks are trademarks of CBS Studios Inc.