Its really sort of like an episode on the original Star Trek TV show where the crew comes upon these two aliens who are locked in a fierce battle of hatred with each other. The two men are humanoid  except for being split down center of their head where they are white on one side of their face and black on the other. The show mostly entails the aliens explaining why they have contempt for  the other and why they therefore must fight. Finally at the end of the show Kirk asks what the problem is since the two both look the same. The alien, played by Frank Gorshin, responds: "Can't you see we are completely different. I'm black on the right side of my face and white on the left, while he is black on the left side of his face and white on the right."