If the alien in the dream acts fidgety or ill at ease, ask yourself how comfortable you are with yourself and your appearance. Do you shy away from mirrors and eye contact or feel self-conscious? Also, are you intimately aware of your own inner nature?
Apprehension toward: Sometimes one must reach out and embrace the unknown to overcome fear. This includes welcoming hidden aspects of self and the Universe.
Traveling with aliens by choice: The need for a new beginning, or a wish to retreat far away from the current situation. Alternatively, someone looking for new friends, hoping to relocate, or just wanting some adventure.
If so, reach for the stars!
In New Age ideology, potentially an emblem of our kinship with all beings within a very large and vastly unknown Universe.... The Language of Dreams
Aliens appear perhaps to remind us that we are not alone in the universe Dreams of aliens arnvmg may present literal expenences and contact with beings from other galaxies. Such dream encounters may result in profound expenences of light and sound in which the dreamer feels altered in some way. Aliens crowding around you in your dream may also reflect your own feelings of living in an alien nation, indicating your sense of isolation and alienation from others.... Ariadne's Book of Dream
If kidnapping features in your dream, this may suggest the desire to dominate or be dominated by another person.
If you are the victim but don’t feel afraid, this could lend a sexual connotation to your dream.
If you are held hostage in a dream, this could indicate that you feel someone has a hold on you, or that you are subject to some influence that prevents you from doing what you need to do. Hostage-takers often make demands for money, personal recognition and so on. Is there someone in your waking life who is placing unnecessary demands upon you, or making you feel guilty? In some hostage dreams, as in real life, a rapport develops between the victim and the hostage-taker; if this is the case, it could indicate a love-hate relationship in your waking life. Finally, might this kind of dream not also suggest that you are held hostage, not by a person, but by your fears?
See also CHANGE AND CONFLICT; NEGATIVE EMOTIONS.... The Element Encyclopedia