Spock was born in 2230 on the planet Vulcan and initially served as a Starfleet officer for several decades before going on to become a Federation ambassador. As a young lieutenant he served as science officer aboard the U.S.S. Enterprise NCC-1701 under the command of Captain Christopher Pike. When Captain James Kirk took command of the vessel in 2265, Spock was promoted to first officer, before eventually being promoted to Captain.