Muteki chôjin Zambot 3

Invincible Super Man Zambot 3 is an anime series created by Yoshiyuki Tomino and Yoshitake Suzuki, and produced by Sunrise. It was first broadcast on Japanese TV in 1977. The series lasted for 23 episodes.

There was once a planet named Beal that was wiped out by the mysterious "Gaizok". The few remaining survivors escaped to Earth and split into three families, named Jin, Kamie, and Kamikita respectively. While attempting to start a new life, the collectively known "Jin Family" prepared for the inevitable Gaizok invasion on Earth and its giant mechanical beasts known as "Mecha Boosts". In order to defend their new home, they have built three vehicles which when combined form the mighty Zambot 3. The Jin Family must not only defend against Gaizok attacks, but also harsh criticisms from the very people they protect, who blame the Jin Family for the invasion in the first place.