 " Q @-@ Less " is the sixth episode of the first season of the American science fiction television series Star Trek : Deep Space Nine ( DS9 ) . Set in the 24th century , the series follows the adventures on Deep Space Nine , a space station located near a stable wormhole between the Alpha and Gamma quadrants of the Milky Way Galaxy . In this episode , Vash ( Jennifer Hetrick ) , a former love interest of Captain Jean @-@ Luc Picard , arrives aboard the Deep Space Nine station trying to elude her companion , Q ( John de Lancie ) , and make a profit selling archaeological artefacts from the Gamma Quadrant , including a mysterious alien crystal . " Q @-@ Less " saw the return of Vash and Q , two recurring characters from Star Trek : The Next Generation ( TNG ) . It was Jennifer Hetrick 's final performance as Vash and John de Lancie 's only appearance as Q on Deep Space Nine . 
