Several men land on Mars to check to see what happened to a civilization that was there. Analysis shows that they were wiped out by a form of chicken pox. All that is left is dehydrated ash that looks like leaves blowing in the wind. There are no Martians as far as they can tell, but their machines are left behind, and one of the Earth men gets taken over by some force. He begins to kill his own people. The sad thing is that many are undisciplined, insensitive people who have no respect for the place they are exploring. This plays into the destruction that the guy (played by David Carradine who was Cain on "Kung Fu," has in mind. For some reason this just doesn't work. There is really no point other than some obtuse ending. Sometimes Bradbury was too cute for his own good.