Koji Kaboto tries his OVT that he made with pieces of mecano. When flying, he is attacked by the UFOs of Vega. Fortunately Duke Fleed arrives on time to save the day (but not too quickly nonetheless). Koji does not actually know that Duke Fleed is the prince of Fleed.

Koji discovers the identity of the Duke Fleed, but has no time to ask questions because Vega attacks. Duke Fleed and Koji unite their power and push back the enemy.

Dampee Makeeba organizes a party at the ranch and invites Koji and Duke Fleed. The latter has no time to eat anything because Vega attacks. Will he have the time to make it to Grendizer before the earth is ravaged? All bets are open...

Gandal wants to discover the hiding place of Grendizer. So he launches a massive attack. Koji tries to confront the enemies alone, but he only succeeds to crush himself on a deserted island. Finally Duke Fleed makes it there and saves the day.

Koji, Hikaro, Goro and Bunta are taken in hostage. Actarus interrupts his siesta to free them.

Hikaro leaves for Perlepolis with Bunta. Their bus is attacked by a monster of Vega. Koji distracts the monster the time that Duke Fleed arrives (Grendizer has trouble to start up in winter).

Janus, from the fearsome Ruins' Division, attacks Grendizer that is powerless in front of the brutality and the agility of his enemy.

Blaki sets a trap to Grendizer by hiding mines in a cloud of spatial dust. Koji falls in the trap. Fortunately Duke Fleed helps him and destroys the Golgoth 8.

Koji is captured with his UFO by the Vegans. Grendizer attacks the camp of the black Moon to save him.

An inhabitant of the planet Rubi is contacted by Vega to explode the UFO carrier of Grendizer. The mission fails because of Duke Fleed and the Vegans try to kill the Rubinian. But Duke Fleed flies to his help.

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.

Daisuke and Kogi are sent to investigate an avalanche and to find survivors. They find a girl named Mirana who lost her memory. Back at Space Science Centre she begins to remember how a saucer destroyed her home.

A new Vegan mecha comes to destroy Earth. It sucks power from the sun and burns everything in its path. Grendizer is damaged by it and has to withdraw. As the mecha attacks again Grendizer has to go to battle weaponless.

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.

Commander Yara is forced to create a mecha that creates earthquakes and use it on the city Kanto.

A Vegan pilot lands near the Space Science Centre and makes Mr. Hayashi's fiancé, Kaori, a spy for him. She takes Dr. Umon as a hostage.

The Vegans begin building a base for their operations on Earth. The saucer "Giba Giba" begins to attack but Grendizer comes to save the day by saving a town and a mountain.

Dr. Umon made a project so that Grendizer is able to launch without revealing his whereabouts to the enemy. Kabuto is control by the Vegans and fights Duke.

A huge meteor is headed straight gives order to fire on the meteor and change its course to head for the planet Earth. The meteors are detected and Grendizer launches to intercept them before they hit land.

Daisuke gets the suspicion that the Vegans may be planning to pull the moon down to Earth. Duke Freed launches Grendizer and follows Koji who already went to explore the area of Mount Kirofoki.

The Vegans plan to melt ice in the North Pole. This will cause the sea level to rise with catastrophic results to the shores on Earth.

The Vegans are planning to steal Dr. Chibana's new device so that they can use it to silence Duke Freed and his Grendizer.

The Vegans continue their attempts to discover Grendizer's secret hideout as they are sure that the Space Science Centre has something to do with it. Hikaru finds out who Daisuke really is.

Commander Witer successfully sneaks into Earth as Dr. Space who is a well-known acquaintance of Dr. Umon and a reliable person so he can find Duke Fleed and kill him.

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.