Invincible Robo Trider G7(1980)

Muteki Robo Trider G7

Takeo Watta inherits a company upon his father's death. The company focuses on space travel, and the transformable robot Trider-G7 is their greatest creation. When an evil space organization lead by Lord Zakuron starts attacking Earth, Watta has to use Trider in a more combat-oriented way.

(Source: Anime News Network)