Bangka in 1981. A brother and sister were fighting over a 'pet' known as Mawang. A large, hairy, fanged and sharp-nailed creature. The older brother wants to keep Mawang, so that he can become powerful and wealthy. In the end, the Mawang was locked up by the younger brother in a sacred box. 30 years later, a griup of researcher accidentally finds and opens the sacred box. Mawang escapes and terrorizes them and the surrounding community.