Johnny Sokko and His Flying Robot (1967)

Johnny Sokko is an ordinary boy whose life takes an extraordinary turn on a boat voyage when he meets a young man who befriends him. The boat is suddenly sunk by the minions of the terrorist organization known as the Gargoyle Gang, who have a penchant for using giant monsters and giant robots in their attacks. Finding themselves on an island base, the pair meet up with a scientist who has constructed the most advanced and powerful robot of all. Upset that his creation will be used for evil, the scientist shows the pair the robot and its wristwatch voice controller, set to imprint the next speaker as the sole person who can command the robot. Impulsively, Johnny speaks into it and becomes that controller. With the robot's power, they escape from the island and Johnny learns that his new friend is an agent of the worldwide intelligence and anti-terrorist organization Unicorn, which is dedicated to opposing the Gargoyle Gang. With no other alternative, Unicorn recruits Johnny as a full regular agent. Now, Johnny has a vital role in this new war as the one person who can bring the tremendous strength and weapons of Giant Robo (the name that he gives the robot) to bear against the forces of evil.