Mr. Spock's father is Sarek, a five-letter name. Sarek is a fictional character in the Star Trek universe, first appearing in the original series episode 'Journey to Babel'. He is a Vulcan ambassador and the father of Spock, the half-Vulcan, half-human science officer of the USS Enterprise. Sarek is portrayed as a logical, stoic, and highly respected figure. He is known for his strong sense of honor and justice, and his devotion to the Vulcan way of life.