Under Clarke’s direction, Welfare and Fairley travelled five  continents to interview witnesses of strange and unexplained phenomena: monsters from the depths of oceans and lakes; showers of fish and frogs; brilliantly lit unidentified flying objects in the night sky; the yeti and his cousin Bigfoot. Other, more threatening events are also evaluated in the hope that evidence can be gleaned which may prevent further catastrophe. Based on the Yorkshire Television series of the same name. Stonehenge photo by Adam Woolfit. Crystal skull, Museum of Mankind, London.