Koichi Chiba

Dr. Shizuma invented a revolutionary new form of renewable energy drive but had to pay a heavy price for his success in a catastrophic accident that the world wants to forget. 10 years later the secret organization Big Fire have obtained two of three mysterious Shizuma drives as part of their world domination plans. The third drive has however been taken by Dr. Shizuma who during his escape is saved by Giant Robo. A desperate struggle begins between the Giant Robo and Big Fire for the control of the last drive as Big Fire unleashes their ultimate weapon, the Eye of Volger.

In the year 2005 a race of alien monsters emerge from underground and launch a series of attacks on the city of Tokyo. The only defense against these creatures is the awesome giant robot GaoGaiGar and its pilot, Guy Shishio.

A.D. 2087 - the United Lunar Empire Giganos wages war on the Earth Federation Military to take control of the planet and establish a "rebirth" of the human race. During an invasion of a colony by Giganos' forces, three civilian men stumble upon a trio of top-secret Metal Armor units called "Dragonars" and pilot them to combat the enemy forces.

The adventures of a young Spanish boy named Esteban who joins a voyage to the New World in search of the lost Cities of Gold and his father.