Barnaby Barnaby was a Human male who served as a Starfleet officer during the late - 24th century . History . In 2370 , Barnaby was serving as a security officer on the when he , along with other members of the crew , transported down to a rogue Borg planet in search of Lieutenant Commander Data who had unknowingly been captured his android brother Lore . After searching the planet Barnaby was one of the last to return to the ship , where he relieved Ensign Taitt at the tactical station . He served in that position under the temporary command of Doctor Beverly Crusher due to many of the senior staff still being on the planet . Due to the presence of a Rogue Borg ship in orbit , the " Enterprise " was forced to abandon the planet temporarily . Barnaby later implemented a plan to drop out of warp as close to the planet as possible in order to rescue the few remaining crew members of the search party , making the precise calculations needed to ensure success . Initially , he was skeptical of Ensign Taitt ' s abilities due to her lack of experience , but she soon proved herself after coming up with an experimental plan to successfully destroy the Borg ship using a solar fusion eruption , thereby allowing them to safely rescue the crew from the planet . ( ) Memorable quotes . " " If your calculations are even slightly off , we ' d hit the atmosphere . " " < br > " " I ' ll have to be sure my calculations are accurate , Ensign . " " < br > " " If her calculations are off , that eruption could encompass us . " " < br > " " Well I ' ll just have to make sure my calculations are accurate , Lieutenant . " " < br > Appendices . Background information . Barnaby was played by recurring " Star Trek " guest actor James Horan who also played the role of Jo ' Bril in , a Takaran scientist who attempts to steal the very metaphasic shielding technology later used in , and in doing so endangers the life of Doctor Crusher . When Crusher discusses the technology with Barnaby in " Descent , Part II " , he replies , " " I know about that research . " " In an interview with StarTrek . com he commented that he found acting in makeup easier than without as , " " the character is sort of made for you when you ' re wearing that mask . " " During production the character was rumored to become a recurring one but ultimately this never materialized . The script for " Descent , Part II " describes Barnaby as , " " an older , seasoned veteran . " " Apocrypha . Barnaby appears as a selectable crewmember in the video game " " which gives his first name as " Albert " and describes him as serving with distinction throughout his Starfleet career . It also reveals that he was born in 2343 on the planet Zadar IV to mother Lee and father Edward , which would make him 27 years of age in " Descent , Part II " . His biography also states that he has a brother named Harold who lives on Meezan IV . It goes on to explain that he graduated Starfleet Academy in 2364 in the 91st percentile with his first assignment being as a security officer aboard the USS " Enteprise " - D . In 2366 , he was promoted to lieutenant junior grade and two years later went on to be selected for tactical field training in which he excelled during simulations . Following this , he was promoted to lieutenant and assigned as relief tactical officer on the " Enterprise " . After the destruction of the ship in 2371 he was posted to the in the same position , serving with distinction during the Borg encounter at the Battle of Sector 001 in 2373 . His biography lists his interests as volleyball , wind surfing and martial arts , in which he has a third degreee black belt in Tae Kwon Do . According to his StarTrek . com biography , Barnaby ' s first name is Barthalomew .