Nagata was a Starfleet engineer who served in Montgomery Scott's team aboard the USS Enterprise.

In 2268, Lieutenant Nagata came across Miles O'Brien and Julian Bashir; Bashir was surreptitiously scanning for Arne Darvin using a medical tricorder, while O'Brien was pretending to make repairs. Nagata thought O'Brien and Bashir were doing the repair work that Scotty had assigned him and questioned why Bashir was using a medical tricorder. Bashir covered, by saying that he was studying work-related stress, which came in handy when O'Brien accidentally disabled the lights in the corridor. Bashir said O'Brien was stressed and they withdrew, saying they were going to sickbay. (DS9 episode & novelization: Trials and Tribble-ations)

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