Qin Yu's girlfriend mysteriously died while investigating the biological crime group Kas. To successfully expose this evil biological organization in court, Qin Yu follows Jason to gather evidence of the group's crimes but is attacked by a group of mutated snakes and accidentally ends up on the island where the Kas group is conducting illegal experiments. The island's strange ecological environment and the continuous attacks from giant snakes put Qin Yu and others in life-threatening situations. They then band together to escape danger and reveal the crimes of the Kas group to the public.