Spencer Stone was a Vulcan/Human hybrid serving as a Science, and later a Navigation Officer, in Starfleet during the 24th century.
While at the Academy he focused on computer systems, communications, and artificial intelligence, even though several instructors tried to get him to embrace his natural piloting skills and take the Navigation track.
He served his cadet cruise at Memory Alpha, rewriting security coding.
His roommate aboard the ship was Assistant Operations Officer Stovic, a fellow Vulcan.
During the Lionheart's shakedown cruise Stone detected an encrypted subspace signal from the uninhabited Balin System. The ship diverted to Balin IV and sent away team to investigate the unregistered Harlian mine on the planet. Meanwhile, Stone decoded the message, revealing it to be from the mining colony to the Tal Shiar and containing information on Starfleet deployments throughout the BeTau Sector. When Ensign Evans left the ship to engage a Harelian freighter in the Sarkhova, he manned the Conn. ("Shakedown Cruise")
During the attempted Maquis hijacking he was held hostage on the bridge along with Garrett and Chief Trev-Kosh. When Garret's throat was cut, blood splatter coated his face and splashed into his mouth, causing his emotional control to lapse. Stone snapped his bindings and attacked Cazzarros. ("Party Crashers")
During the Battle of Torros III the Lionheart's Conn broke loose, killing Lieutenant Junior Grade Sortyn and severing Stone's left leg below the knee. He was evacuated by a runabout to the USS Brigid. ("Declaration")
After the Dominion War, Stone transferred to the USS Gorkon along with Christoffer Williams and Susanne Flame as Navigation Officer.