Invincible Super Man Zambot 3 - S01

There was once a planet called Beal, until it was destroyed by a mysterious entity known as Gaizok. The few survivors who made it out fled to Earth and split into three families: Jin, Kamie, and Kamikita. While trying to build a new life, the group known together as the "Jin Family" prepared for the inevitable Gaizok invasion of Earth and its giant mechanical beasts, the "Mecha Boosts". To defend their new home, they built three vehicles that combine into the mighty Zambot 3. The Jin Family must fight off the Gaizok attacks, but also the harsh criticism of the very people they protect, who blame the Jin Family for the invasion in the first place.