Voyage Into Space

Earth is invaded by an interstellar terrorist group known as Big Fire (called the Gargoyle Gang in the American version), led by Emperor Guillotine, who remains mostly in a multicolored spaceship hidden at the bottom of Earth's ocean, from which he issues his commands. Big Fire is capturing scientists to develop an army of monsters to conquer the planet. 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 are subsequently captured by Big Fire. They escape to a location where a Pharaoh-like giant robot is being constructed by the captive scientist Lucius Guardian, who provides Daisaku and Jūrō with the robot's control device. Guardian assists them in escaping before being shot to death; just before his death, he triggers an atomic bomb that destroys the base. The radiation from the explosion activates the robot, which now obeys only Daisaku.