Plot: Did a Chilean family photograph a real UFO flying above the Andes Mountains? Is footage of a tall, dark-colored, hairy creature walking through the woods proof the legendary Ohio Grassman exists? Does a huge, 5,000-year-old horn discovered on a beach in England belong to a prehistoric creature that still lives? Scientists and citizens attempt to decipher the mysterious inscription of a sword found in River Witham, Lincolnshire. Tony Harris and his team of experts examine the clues and make a determination about the validity of what we're seeing