In 1997, over the city of Phoenix, Arizona, one of the most spectacular mass UFO sighting of all time took place. Thousands of people witnessed a series of bright orange orbs moving in formation silently overhead. Despite hours of video and photographic evidence this case remains unexplained. Craig and space journalist Sarah Cruddas talk to eyewitness nurse David Parker who provides a vivid description of his close-up encounter with a huge boomerang-shaped UFO that passed directly overhead. They also investigate the response by the authorities in the days following the UFO event