A scientist doing illegal stem cell research is trying to find a cure for cancer. After shark cells were transferred to a human test subject, the patient recovered well again and it looked like a successful treatment. But the experiment went wrong, and the man turned into a monster: half shark and half human. But the scientist knows how to use this to his advantage. He has invited some of his old friends to the island, hoping to take revenge on them for his new creatures. But what tricks do they have up their sleeves?