Watch Punnami Naagu
This is a Telugu film from India. It tells the tale of a man name Naagulu, whose father has been secretly feeding him venom since birth. Every full moon, he turns into a cobra and unwittingly seeks out victims. Naagulu's father's dying confession of his secret sets the young man on a hunt for a cure to his condition. As he tries to prevent himself from becoming a snake for eternity, Naagulu's adventure has only begun.