6x52 - Unsolved Mysteries

""Mysteries of Alien Beings"" reports on four men who say they were abducted while on a fishing trip in Maine's Allgash Wilderness, and includes research by Harvard psychiatrist John Mack. Also: a pilot's alleged UFO sightings in Kazakhstan; efforts to locate a nurse who reportedly helped with autopsies of alien beings that emerged from the wreck of a UFO.