In Search of... is an American television series that was broadcast weekly from 1976 to 1982. It was originally hosted by Leonard Nimoy. The show conducted investigations into the controversial and paranormal (e.g., UFOs, Bigfoot, and the Loch Ness Monster) It featured episodes about mysterious historical events and personalities such as Anna Anderson, the Lincoln Assassination, the Jack the Ripper murders, and missing persons, cities, and ships. The original series was shown in Australia in the 1980s under the title Great Mysteries of the World.