Reginald Endicott Barclay III (often referred to as "Reg") was a highly talented Human Starfleet systems diagnostic engineer who lived in the 24th century. In his early days aboard the Enterprise-D, he frequently displayed nervous behavior, demonstrated a noticeable lack of confidence, stammered frequently, was extremely introverted, and occasionally bumbled. These traits aroused the derision of some of his shipmates on the USS Enterprise-D – with some even going as far as calling him "Lieutenan