Kaal Bhairav Rahasya (The mystery of Kaal Bhairav) is an Indian thriller television series. It is an official remake of the first season of 1996, thriller/mysterious Tamil tele-series, Ragasiyam, which aired under the name, Marmadesam series. Directed by Naga and produced by K. Balachander, it was based on the book by Tamil Author, Indra Soundar Rajan.