USA
Host Robert Stack presides over an investigation into unsolved mysteries ranging from murders to UFO sightings. Through reenactments and interviews, viewers are presented with the known facts of each case. Anyone with additional information is then urged to contact the show's producers via a toll-free telephone number. - IMDb
| Les enquêtes extraordinaires |  France |
| Megoldatlan rejtélyek |  Hungary |
| Mistérios sem Solução |  Brazil |
| Misterios sin resolver |  Chile |
| Misterios sin resolver |  Spain |
| Misterios sin resolver |  Mexico |
| Misterios sin resolver |  Peru |
| Unsolved Mysteries |  Philippines |
| Unsolved Mysteries |  Singapore |
| Unsolved Mysteries | USA |
| Unsolved Mysteries |  South Africa |
| Unsolved Mysteries |  Australia |
| Unsolved Mysteries |  Canada |
| Unsolved Mysteries | Canada |
| Unsolved Mysteries |  West Germany |
| Unsolved Mysteries |  Ecuador |
| Unsolved Mysteries |  India |
| Unsolved Mysteries |  Italy |
| Unsolved Mysteries |  Japan |
| Unsolved Mysteries with Dennis Farina |  United Kingdom |
| Неразгаданные тайны |  Soviet Union |
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Jillian Henry [1] | Zenith Elaine Helton (TV Episode: 9.10) (1997) |
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Alex Black [12] | Kenny (TV Episode: Ghost Boy) (2001) |
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Cole Petersen [9] | David (TV Episode: Maryanne's Story) (2001) |
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Tyler Neitzel [8] | Boy in Park (TV Episode: 11.3) (1999) |
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Bryan Shilowich [7] | Chuckie McGivern (TV Episode: 5.15) (1992) |
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Jordi Vilasuso [14] | Frank (TV Episode: 8.3) (1995) |
