Resume : Thousands of years ago, the people of the planet Campbell decided to leave their planet and seek out new worlds to inhabit. One group, led by the scientist Oreana, landed on Earth, but was delayed from their mission. In the early 21st century, Oreana's group reawakens and begins their plan to conquer the Earth. The only effective defense against the Campbellians' giant bio-mechanical slave beasts is the super-electromagnetic robot, Combattler V and its pilots.

The entire series follows the then-standard monster-of-the-week format, with the first season featuring Garuda sending various mecha to defeat Combattler V. His tactics range from brute force to cunningness and taking hostages. He even duels Hyouma in a sword fight with their feet chained together; though just as Hyouma is about to kill him, he is saved by Oreana. As the series moves on, his trust for Oreana lessens. Garuda eventually discovers that he is in fact a cyborg, and uncovers a robot specifically designed for him. In the final episode of the first season, he defeats Oreana, and duels Combattler V, which eventually leads to his defeat.

The second season features Empress Janelor and her generals Dungele and Warchimedes. The way the second season is structured is quite similar to that of the first, but involves more serious plot points such as the taking of hostages and plots to kill the team. Eventually, the entire base of the Campbellian empress is deployed, and only through the help of the airborne Nanbara Connection Base is Combattler V able to destroy it. However, Janelor manages to deploy an "Earth Bomb" which is supposed to destroy the Earth. Notably, the team is not dispirited, but are quite calm and instead happy for having the chance to fight to protect Earth. Just as it looks as though Earth will be destroyed, the "true" leader of the Campbellians, Deus, riding in a golden wagon, informs the team of the coup d'etat at Campbell, and stops the bomb seconds before it reaches the Earth.