The peaceful planet of Jillucia has been nearly wiped out by the Gavanas, whose leader takes orders from his mother rather than the Emperor. King Kaiba sends out eight Liabe holy seeds, each to be received by a chosen one to defend the Gavanas. Each recipient, ranging from hardened General Garuda to Gavana Prince Hans to young Terrans Meia, Kido, and Aaron all have different reactions to being chosen.
Earth is invaded by an interstellar terrorist group, Big Fire (the Gargoyle Gang in the American version), led by Emperor Guillotine who spends most of his time in a multicolored space ship hidden at the bottom of Earth's ocean, from which he issues his orders. Big Fire is capturing scientists to create an army of monsters to conquer Earth. A boy named Daisaku Kusama (Johnny Sokko in the American version) and a young Unicorn agent named Jūrō Minami (Jerry Mano in the American version) are shipwrecked on an island after being attacked by a sea monster and subsequently captured by Big Fire. They flee to where a Pharaoh-like giant robot is being built by captive scientist Lucius Guardian, who gives Daisaku and Jūrō its control device. Guardian helps them escape before he is shot to death; before he dies, he triggers an atomic bomb which destroys the base. The radiation activates the robot, which now obeys only Daisaku.
A powerful terrorist organization known as the Black Cross Army threatens to destroy the Earth, with only the defense organization EAGLE (EArth Guard LEague) able to oppose them. In retaliation, Black Cross Army destroys multiple EAGLE headquarters across Japan, killing all but five people. Now, these five remaining EAGLE members are called to form a secret, powerful team known as Gorenger, the only force left that has a chance to stop the Black Cross Army and their evil leader, Black Cross Führer.
