<Tr> <Th> Posting </Th> <Td> Vulcan ambassador to the Federation </Td> </Tr> <Tr> <Th> Rank </Th> <Td> Ambassador </Td> </Tr> <P> Sarek / ˈsærɛk / 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 originated by Mark Lenard in the 1967 episode "Journey to Babel" (Lenard previously portrayed a Romulan Commander in another episode of the original series, 1966's "Balance of Terror"). Lenard later voiced Sarek in the animated series, and appeared in Star Trek movies and the series Star Trek: The Next Generation . </P> <P> Actor Jonathan Simpson played a younger Sarek in a brief scene in Star Trek V: The Final Frontier, with voice - over provided by Lenard . Ben Cross portrayed Sarek in the 2009 motion picture Star Trek . James Frain plays Sarek in the new TV series Star Trek: Discovery . </P>

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