A series of explosions start to occur under the sea and General Zuril wastes no time in discovering that this is raw Uranium. Saucer beast "Boi Boi" is launched to go and get this energy as this saucer beast naturally collects Uranium. At the same time Dr. Umon is alerted by these explosions which are close to an island with a Uranium capsule.
A mysterious terrorist organization creates chaos and destruction. While the Japanese police, led by Inspector Aki Natsuko, is in pursuit, a single woman on a motorcycle stops and defeats them. Gold Claw, and the terrorist organization Panther Claw, battle the mysterious woman: Cutie Honey, the warrior of love.
King Vega prepares to attack Earth but Duke and company are ready to stop him with the help of Grendizer and Spazers.
uke Freed's childhood friends Nayda, brainwashed by the Vegans, attempts to put a bomb on Grendizer but Duke stops her. Nayda accuses Duke of being a traitor. Koji attempts to pilot Grendizer but is almost killed.
Dr. Umon sends Koji and Hayashi on a mission in outer space to build a satellite station. At the same time, the Space Science Centre is surrounded by a huge Minifo saucer squadron.
Princess Rubina, Duke Fleed's fiancé comes to Earth to tell Duke that his planet is no longer polluted but dies after being shoot by one of Vega's generals.
Duke finally destroys King Vega but he and Maria must return to planet Fleed.
Maria has a nightmare about her father being hostage. She goes to the cave where she saw her father in her dream along with Koji where she learns the truth.
Koji and Maria are on their vacation in Tokyo, they get into a fight as usual and split up.
Koji, Hikaro, Goro and Bunta are taken in hostage. Actarus interrupts his siesta to free them.
The Vegans plan is to bring Grendizer to the shadow of the moon during the eclipse because Grendizer's systems will shut down temporarily under it and then destroy it.
Duke Freed will go after Hikaru who is hostige on foot not using Grendizer and help her escape from the giant beast while Koji takes Grendizer back for repairs.
Boss, Nuké, and Mocha are in this episode. They are visiting their old friend Koji Kabuto. The Vegans keep their eye on a mysterious orange robot that is found skiing near-by. Commander Blacki orders the Minifo to follow it and investigate.