A representative of an alien race that went through drastic evolution to survive its own climate change, Klaatu comes to Earth to assess whether humanity can prevent the environmental damage they have inflicted on their own planet. When barred from speaking to the United Nations, he decides humankind shall be exterminated so the planet can survive.
An alien and a robot land on Earth after World War II and tell mankind to be peaceful or face destruction.
An adolescent with the ability to control a looming war-golem becomes entangled in the Experts of Justice's fight against the infamous group Big Fire.
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.