Little Otters to the Rescue

In the mangroves of northern Singapore lives an otter by the name of Ah Xiong. He is captured while looking for food for his pregnant wife. Ah Xiong's wife, Xiao Fen, eventually gives birth to four unique otters, each with a special characteristic. When these baby otters grow up, they learn of their father's story, which spurs them on to plan a rescue mission. During the rescue, they face obstacles and life-endangering situations. Will they be able to overcome all these and rescue their father?