Sarek is a fictional character in the Star Trek media franchise. He is a Vulcan astrophysicist, the Vulcan ambassador to the United Federation of Planets, and father of Spock. The character was originally played by Mark Lenard in the episode "Journey to Babel" in 1967. Lenard later voiced Sarek in the animated series, and appeared in Star Trek films and the series Star Trek: The Next Generation.

Vulcans, sometimes referred to as Vulcanians, are a fictional extraterrestrial humanoid species in the Star Trek universe and media franchise. In the various Star Trek television series and films, they are noted for their attempt to live by logic and reason with as little interference from emotion as possible. Known for their pronounced eyebrows and pointed ears, they originate from the fictional planet Vulcan. In the Star Trek universe, they were the first extraterrestrial species to make contact with humans.