The interpretation of seeing and interacting with a stranger, or strangers, in your dream depends on the details of your dream and on your personal belief system.
These spirits may be teaching you lessons or giving you specific messages.
The more modern approach to interpreting a dream with strangers in it is that they represent different sides or unfamiliar aspects of our personality.
Whether the message is coming from your unconscious or from a different reality might be irrelevant.
The lessons gained through a dream are far more important then where they came from.
Just remember: The mind that dreamt the dream also knows its source and meaning (and that is YOUR own mind).
See also: People
Dreams in which a stranger brings you an important message represent your unconscious mind telling you what you need to hear.
This dream can also represent your feelings about someone you love who has died.
If you dream of being in love with a stranger in your dream, especially if the dream is recurring, your heart is longing for a true love to call your own.