 Following Data 's defeat at a game of Strategema in " Peak Performance " , Pulaski and Councillor Deanna Troi ( Marina Sirtis ) attempt to console him , but it is left to Captain Picard to convince Data that he is not malfunctioning . Pulaski 's final appearance on The Next Generation was in the episode " Shades of Gray " . When Commander Riker falls ill to a dangerous virus during an away team mission , Pulaski drives out the virus with a device that stimulates his memory centre . After she discovers that negative memories are more effective in removing the virus , she uses memories of fear and survival to save Riker 's life . 
 Following Data <a href='null_genetive' title='1'><mark>'s</mark></a>defeat at a game of Strategema in " Peak Performance " , Pulaski and Councillor Deanna Troi ( Marina Sirtis ) attempt to console him , but it is left to Captain Picard to convince Data that he is not malfunctioning . Pulaski <a href='null_genetive' title='2'><mark>'s</mark></a>final appearance on The Next Generation was in the episode " Shades of Gray " . When Commander Riker <a href='uninflect' title='3'><mark>falls</mark></a> ill to a dangerous virus during an away team mission , Pulaski <a href='uninflect' title='4'><mark>drives</mark></a> out the virus with a device <a href='null_relcl' title='5'><mark>that</mark></a><a href='uninflect' title='6'><mark>stimulates</mark></a> his memory centre . After she <a href='uninflect' title='7'><mark>discovers</mark></a> that negative memories are more effective in removing the virus , she <a href='uninflect' title='8'><mark>uses</mark></a> memories of fear and survival to save Riker <a href='null_genetive' title='9'><mark>'s</mark></a>life . 
Following Data  defeat at a game of Strategema in " Peak Performance " , Pulaski and Councillor Deanna Troi ( Marina Sirtis ) attempt to console him , but it is left to Captain Picard to convince Data dat he ain't malfunctioning . Pulaski  final appearance on The nxt Generation was in da episode " Shades of Gray " . When Commander Riker fall ima to a dangerous virus durin an away team mission , Pulaski drive out tdavirus wit a device stimulate his memory centre . After she discover tdatnegative memories r more effective in removing the virus , she use memories of fear and survival to save Riker  life .