In a futuristic setting of interstellar exploration in 1999, the ambitious Emperor Zule of the planet Gishin seeks to dominate the galaxy, sparking a clash with Earth. To execute his devastating plan, he dispatches a young child named Mars, along with the colossal robot Gaia armed with a planet-destroying energy source. Mars, rechristened as Takeru by his Japanese adoptive family, grows up with a deep affection for humanity, defying Zule's directive to activate Gaia's destructive payload. The catch: if Takeru perishes, Earth faces obliteration from Gaia's payload. Endowed with psychic abilities, Takeru enlists in the Crasher Squad, Earth's elite defense unit, to safeguard his home planet. As Takeru and his comrades brace for Gishin's assault, his bond with his estranged brother Maag adds a poignant layer to the conflict. Unbeknownst to Gishin, Takeru's father clandestinely developed five additional robots, including Sphinx, Uranus, Titan, Shin, and Ra, meant to merge with Gaia into the formidable Godmars when Earth's safety hangs in the balance.