All Earth's cities have been destroyed by the alien invasion, and humanity's survivors live in shanty towns and villages.

Kento, a war orphan, and his companions hide in a cave to escape the villagers from whom they stole food from.

Doctor Earl had fled to Earth with him the greatest achievement of Helian technology: the super-robot Atlaus, whose power increases in combination with the intelligent lion robot Beralios.

Tadao Nagahama influenced the series' artistry and direction, and its style resembles those of Voltes V and Combattler V. The super robot Daltanious was formed from three components: Atlaus (the main robot), Gunper (the spaceship) and Beralios, the mechanical lion who was recovered after the first battle with Akron.

Like all Super Robot anime titles, Daltanious had a die-cast toy replica produced by Popy during its run.