Takeshi Hongo and FBI agent Kazuya Taki fake their deaths when they are attacked by Shocker soldiers during a motocross race. They disguise themselves as Shocker soldiers and infiltrate the main headquarters, but it doesn't take too long for Ambassador Hell to find their whereabouts and trap them. Before he detonates a bomb within the base, Ambassador Hell tells Kamen Rider 1 and Taki that Shocker is preparing a giant laser capable of destroying cities. Our two heroes must escape from the base's self-destruction and stop Shocker from arming their latest weapon. Not only that, they must rescue Tachibana and the racing club, who have been abducted by Shocker's minions.
Professor Daidōji has developed a gravity machine called the GX Device. Unfortunately, Shocker wants it; so they attack the professor and destroy his laboratory, but come home empty-handed. Shocker's agents find out that the plans for the GX Device are with Daidōji's daughter, who is celebrating her birthday. Now the Kamen Riders, along with FBI agent Kazuya Taki, must protect Daidōji's daughter and prevent Shocker from obtaining the plans.
A teenage boy discovers that the planet Icarus is on a collision course with Earth by gazing through his telescope. Scoffed at by the scientific establishment, the boy is kidnapped and brought to a secret UN base in the Japan alps. He is immediately inducted into the secret program whose mission is to finish the Super-Destruction Beam cannon and destroy Icarus. The cannon is missing a special mineral for the lens. The team heads for a mysterious island in the middle of the Pacific. There they find ancient ruins of Atlantis but they are suddenly attacked by a strange drill shaped metal squid spaceship. It's commanded by the evil being Nazu who has engineered the collision with Icarus! He doesn't want to share the universe with humans and he really doesn't want the cannon finished. The action is on and the team discovers the Golden Bat who has been asleep for over 10,000 years awaiting this very moment to save the earth!
