I'm going in to bat for Enemy Mine again, since everyone ignored my last vote! The whole basis of this movie is that that the repulsive weird alien and the human astronaut have to learn to cooperate if they (or their "line" ) were to survive. It has its modern parallels today. The proposition is that our enemy can be an honourable being, and we do not lose our own honour exploring such a possibility. I think it's a very good film.