Muteki Chōjin Zambot 3

The Gaizok arrive on earth, with the sole intent of the total destruction of the planet, but encounter fierce resistance from the "Jin Family", a group of aliens that fled to Earth following the destruction of their home planet by the Gaizok. The Jin family use the power of the combining mecha "Zambot 3" and the "King Beal" spacecraft to combat the Gaizok and the mecha boosts they utilise in their plans for domination.