Showcases true stories of paranormal experiences, presented in a documentary format by host Robert Stack. These episodes delve into unexplained phenomena, including ghostly encounters, haunted locations, and other mysterious occurrences, often involving witnesses, relatives, and government officials.

"Unsolved Mysteries" has featured several UFO segments, including investigations of the Rendlesham Forest incident, Allagash Abductions, Roswell, Area 51, and the Phoenix lights. These segments often explore eyewitness accounts, government cover-ups, and the possibility of extraterrestrial life.