"Future Robot Daltanious" is a 47-episode anime series set in a distant future where Earth has been conquered by the malevolent Emperor Zul of the Atlantean Empire. The story begins with the escape of a young boy named Mondo, who flees from the Atlantean forces after his parents are killed. Mondo stumbles upon a hidden laboratory where he encounters a giant robot named Daltanious, created by his late father. Mondo becomes the pilot of Daltanious, forming a bond with the robot and its AI companion, Marin. Together, they join the Earth Resistance to fight against the Atlantean Empire and its oppressive rule.

The narrative unfolds as Mondo and Daltanious face various adversaries, including Zul's top generals and their advanced mecha. The series explores themes of resistance, loyalty, and the struggle for freedom, as Mondo grows from a frightened child into a determined leader. Key characters include Marin, who provides emotional support and guidance to Mondo, and Kira, a skilled pilot and member of the Resistance who becomes a close ally. The Atlantean Empire, led by Emperor Zul, serves as the primary antagonist, with its forces constantly seeking to crush the Resistance and maintain control over Earth.

As the story progresses, Mondo and his allies uncover secrets about Daltanious' origins and the true nature of the Atlantean Empire. The series features intense mecha battles, strategic confrontations, and moments of personal growth for the characters. The conflict escalates as the Resistance gains strength, leading to a climactic showdown between Daltanious and the Atlantean forces. Throughout the series, the bond between Mondo and Daltanious remains central, highlighting the importance of courage and unity in the face of overwhelming odds. The narrative concludes with a resolution to the war, offering a satisfying end to the struggle for Earth's liberation.