A President of the United States saw one, and launched a $20 million inquiry to find out more about it. A World's Champion boxer saw one as he jogged in New York's Central Park. A Caribbean island leader saw one and urged the United Nations to debate it. Are they meteorites, lumps of space-debris, secret air force tests - or are they really spacecraft from other worlds? Whatever the explanation, thousands, perhaps millions, of people have seen the phenomena that we have come to call 'unidentified flying objects' or UFOs. Police, priests, politicians and pilots have all been astonished by strange craft performing inexplicable antics in the sky. A growing number of people claim they have actually met crewmen from these curious glowing shapes. Some have received injuries from the experience which have defied the best treatments that human medicine can currently devise. Some have even died from eerie encounters. And despite the sceptical governments and scientists who say such things do not exist, UFOs have been and are being seen and watched all across the world. Illustrated.