Earth is invaded by an interstellar terrorist group from Planet Gargoyle, Big Fire, led by Emperor Guillotine. Hiding his spaceship at the bottom of the ocean, Guillotine issues his orders, capturing scientists, as well as hiring other aliens from different planets to create an army of monsters that will rampage on Earth. Participating in the Unicorn Branch Organization in Tokyo, a young boy named Daisaku Kusama, who becomes U7, aids the fight against the alien terrorist organization as the sole controller of a prototype Pharaoh-like giant robot, originally created for Big Fire’s purpose of world domination.
