Most of my approach as a writer had been to look to old movies and say, 'Gee, this would make a good Star Trek or a good western or a good detective story.' The foundation for 'The Galileo Seven' was actually an old [1939] motion picture called Five Came Back. That was about a plane crash in the Andes and the survivors who have to deal with head-hunters over the next hill. I remembered it because it was such a dramatic gimmick, a very tight one.