Muteki Choujin Zambot 3

A planet called Beal was destroyed by a force named Gaizok, prompting its survivors to flee to Earth and divide into three families: Jin, Kamie, and Kamikita. These families, collectively referred to as the Jin Family, worked to establish a new life while preparing for Gaizok's anticipated return and its mechanical creatures, the Mecha Boosts. To defend Earth, they constructed three vehicles that can combine into a powerful robot called Zambot 3. The family faces both the threat of Gaizok and the hostility of Earth's population, who hold them responsible for the invasion.