In a biological research institute in the Pacific Ocean, the latest research on accelerated reproduction of fish has made a breakthrough and has been successfully tested on sharks with extremely low fertility. The scientists in the laboratory were overjoyed and said that this research will completely solve the global food problem. Only the general manager, Dr. Yuan Cong, believed that this move would destroy the existing ecological environment, and ordered the destruction of the experimental sharks against all odds. However, Morey, the deputy of the experimental group, regarded these sharks as his life's work, and stole a few young sharks to prepare for transfer. Unexpectedly, they were bitten on the way and had an accident. The young sharks escaped into the sewer and into the sea. Not long after, several shark group attacks occurred on the beach. It turned out that there was a super huge mother shark behind these sharks...