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