1979 film directed by Tobe Hooper

A fourteen year old bed wetter runs home from school every day to retrieve the wet sheet his mother has hung from his bedroom window to punish him. He races to get there before any of his friends pass the house. This enforced training prepares him to become a competitive runner.

A soldier from Earth crashlands on an alien world after sustaining battle damage. Eventually he encounters another survivor, but from the enemy species he was fighting; they band together to survive on this hostile world. In the end the human finds himself caring for his enemy in a completely unexpected way.