Giant Robo

Earth is invaded by an interstellar terrorist group, Big Fire, led by Emperor Guillotine. Guillotine spends most of his time in a multicolored space ship hidden at the bottom of an Earth ocean, from which he issues his orders. The group captures scientists to create an army of monsters to rampage on Earth. A boy, Daisaku Kusama, and a young man named Jûrô Minami are shipwrecked on an island after their ship is attacked by Dracolon and captured by Big Fire. (wikipedia)