Lieutenant junior grade Costa was a Starfleet engineer technician stationed on board the USS Enterprise-D in the 2360s.

While the Enterprise-D was enroute to Nahmi IV in 2366, he was ordered to realign the magnetic capacitors together with his colleague Duffy. (TNG: "Hollow Pursuits")

By late 2367, Costa was one of only four crewmembers of the Enterprise-D (the others being Data, Geordi La Forge and Miles O'Brien) who had the skill to reprogram thirty to forty isolinear chips in half a dozen subsystems in a short amount of time. (TNG: "The Mind's Eye")

Costa was played by an unknown actor in "Hollow Pursuits" and only mentioned in "The Mind's Eye".
He was given the first name Gar in the ebook War Stories, Book 1.

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