Six God Combination Godmars (1981)

In the twilight of the 20th century, as humanity embarks on a journey beyond the familiar confines of our Solar System, we collide with the ambitions of the distant planet Gishin. Under the iron-fist rule of Emperor Zul, whose galaxy-conquering dreams are as vast as the cosmos, our humble Earth becomes a target. Zul's sinister plan? To dispatch a male infant named Mars and his colossal robot companion, Gaia, to Earth. Gaia, a formidable behemoth, houses a power potent enough to annihilate an entire planet. In accordance with Zul's grand scheme, Mars is destined to mature among humans, only to activate Gaia's cataclysmic bomb, spelling doom for Earth. However, fate takes an unexpected turn when Mars lands on Earth, and a Japanese family takes him in, rechristening him as Takeru. Seventeen orbits around the sun later, Takeru, now deeply ingrained with a profound love for his adoptive species, defies Zul's orders and refuses to detonate Gaia's lethal weapon. But Zul's plan has a fail-safe. Should Takeru perish, Gaia's bomb would activate, turning Earth into a star-crossed casualty. As Takeru navigates this precarious balance between life and death, God Mars transforms into a riveting saga of survival, loyalty, and the indomitable spirit of humanity.

Six God Combination Godmars is an anime show featuring Akio Nojima and created by Mitsuteru Yokoyama.

Six God Combination Godmars is currently streaming for free (ad-supported) on Tubi TV and it's also available on Crunchyroll, Crunchyroll Amazon Channel and Funimation Now.