Lieutenant Duffy was a Starfleet engineer stationed onboard the USS Enterprise-D in 2366. While the ship was on the way to Nahmi IV, he was ordered to realign the magnetic capacitors together with his colleague Costa.
Lieutenant Duffy in 2366
During the mission he was contaminated with invidium and subsequently spread this element throughout several ship systems. While drinking a beer in Ten-Forward, he contaminated his glass with the individium and thereby changed its molecular structure, causing it to leak. (TNG: "Hollow Pursuits")
- Duffy was played by Charley Lang.