What episode introduced Spock's parents, Sarek and Amanda?

“What episode introduced Spock's parents, Sarek and Amanda?” The answer is “Journey to Babel.” The episode, written by D. C. Fontana and directed by Joseph Pevney, first aired on November 17, 1967, as the tenth episode of Star Trek: The Original Series’ second season.

The Enterprise transports ambassadors to a major Federation diplomatic conference on Babel. Among the delegates are Sarek, a formidable Vulcan ambassador, and Amanda, his human wife and Spock’s mother. Their arrival gives the audience its first look at Spock’s family and reveals the personal strain behind his disciplined public persona.

The episode also introduces the Andorians and Tellarites, making it important to the wider political mythology of Star Trek, not merely to Spock’s biography. A common mix-up is “Amok Time,” which explores Vulcan biology and marriage customs but does not introduce Sarek or Amanda. Sarek and Amanda later became major recurring figures in films and other Star Trek series.