During a rainforest operation, Long Zhan passes through a sewer and transforms into a ratman. At the brink of desperation, he binds himself to the Taotie System and unites the ratman tribes. He discovers the descendants of a Chinese family living under surveillance. Taotie issues a mission to redeem their bloodline. During the first rescue attempt, they are surrounded by snipers lying in ambush. With Taotie's help, Long Zhan escapes and reunites with A Fei, an inheritor of Jeet Kune Do. Together, they fight against the mastermind controlling the Harvesters and successfully rescue the descendants of three great families!