Leonard Nimoy, host and narrator of the series, takes you to the world of Unsolved Mysteries and those strange and unusual things in the world that defy explanation and often understanding. The world is filled with unexplained mysteries, paranormal phenomena, strange creatures, and other things that go bump in the night.
Although some of the shows now seem dated based on recent events and discoveries, they are still entertaining and engrossing. As the show states, its purpose is to provide "a possible explanation for the phenomenon being examined". The topics covered are varied and many, and each is worth the viewing.
The show was such a hit that after it's broadcast time ended, it was rebroadcast over and and over and in 2000, the show was revived by the SciFi Channel into an hour long format with the X-Files Mitch Pileggi as the shows host.