A stranger in a dream rarely represents an actual unknown person -- more often it's a part of yourself you haven't recognized yet, or a quality you're growing into. Pay attention to how the stranger makes you feel: that reaction is usually the real message, more than anything they say or do.
Men may be said almost to be compelled by the Stars, even in voluntary actions, by means of their corrupt affections and ignorance. - Cardan Girolamo (1501-1576)