The story tells that Qin Yu's fiancée died unexpectedly while investigating the Cass Group. In order to successfully testify against this evil biological group in court, Qin Yu followed Jason, who had evidence of the group's crimes, onto the cruise ship, but was suddenly attacked by a group of mutant snakes and mistakenly entered the island where the Cass Group was conducting illegal experiments. The strange ecological environment of the island and the giant snakes' repeated attack put Qin Yu and others in a desperate crisis. Then everyone worked together to cooperate with each other to escape danger and successfully made the crimes of the Cass Group public.