Muthassi Season 1 is a supernatural horror thriller set in a remote Tulu village on the Kerala–Karnataka border, where ancient traditions and dark legends still shape everyday life. The story follows Leela and her family after they return to Rajan's ancestral home, only to find themselves haunted by a series of disturbing and unexplained events. As their young son, Sreekuttan, begins exhibiting frightening changes, long-buried family secrets and a sinister supernatural force emerge from the shadows. Torn between faith, fear, and survival, Leela must uncover the truth behind an age-old curse before it destroys everything she loves. Blending folklore, psychological suspense, and chilling horror, Muthassi Season 1 delivers an eerie tale of family, destiny, and the terrifying consequences of the past.