A swashbuckler was a heroic individual who engaged in swordplay. In 2266, seeing a recent pattern in unusual crew behavior due to polywater intoxication, Spock described Hikaru Sulu to James T. Kirk as (being) "at heart, a swashbuckler out of your 18th century." This was after the helmsman, while under the influence of polywater, brandished a sword and chased crewmen around level two's corridor three of the USS Enterprise. (TOS: "The Naked Time" )