The Gatchaman are in trouble and receive help from a mysterious group known as Red Impulse. While cruising near a strange island a submarine is vaporized by a large blast. Summoned to avenge the attack the Gatchaman Group comes upon the secret undersea headquarters of the alien Galactor. In a fierce air and undersea battle the Gatchaman struggle against the Galactor's Jupiter Death Brigade and the evil Black Bird Battalion. Battered by combat, the Gatchaman appear to be on the brink of defeat when, out of the sky, a new force appears led by a mysterious warrior in red.
