This winsome, dark-haired actress has made a pleasant impression on TV since the mid-1980s, playing somewhat nervous and charmingly ditzy or overly optimistic characters. Stevenson began her career as a member of the cast of the short-lived syndicated series "Off the Wall" (1986) and in 1989 made two memorable appearances on "Cheers" as Norm's secretary Nancy. She had a potential big break as the star of the syndicated, six-day-a-week spoof "My Talk Show" (1990), in which she entertained less than stellar celebrities in her Midwestern living room. The show, however, failed to find an audience