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