Unsolved Mysteries is back with new episodes with more perplexing cold cases and supernatural events. Unsolved Mysteries is from the creators of the original docuseries, CosgroveMeurer Productions, and 21 Laps Entertainment, the producers of Stranger Things.Unsolved Mysteries is back with new episodes with more perplexing cold cases and supernatural events. Unsolved Mysteries is from the creators of the original docuseries, CosgroveMeurer Productions, and 21 Laps Entertainment, the producers of Stranger Things.