In the world of the Alien Beast Planet, located 150 million light-years away from Earth, there exist three mechanical beast lifeforms with self-awareness and the ability to speak—known as the Beast Cops. They are: Tiger Beast, Croc Beast, and Falcon Beast. They fight against the savage beasts that seek to destroy the environment. The savage beast leader, Dikaka, leads his forces in escaping from the Alien Beast Planet to Earth, and the Beast Cops must take responsibility and pursue him. Upon arriving on Earth, the Beast Cops lose their original powers. Meanwhile, Dikaka, in order to create an environment where he can survive, transmits savage beasts to Earth through a hidden base in an attempt to take over the planet. Wu Xiaotian and his friends, Ai Lili and Lin Xiaobao, use their own small strengths to help the Beast Cops drive away the savage beasts. The Beast Cops discover that the power of children can help them regain their original strength. Thus, Tiger Beast, Croc Beast, and Falcon Beast decide to form a contract with Wu Xiaotian, Ai Lili, and Lin Xiaobao, making them Navigators. Together, they work to capture the savage beasts, expel Dikaka, and restore Earth's environment.