The invaders are aliens from the imperial planet Boazan, fighting under the command of the Boazanian emperor's ruthless nephew, Prince Heinel.
With their victory all but assured, the Boazanian commanders retire to Castle Heinel, a secret underground citadel constructed by their agents in preparation for their conquest, and deploy the massive bio-mechanical "Attack Beast Knight Dokugaga" to destroy humanity's last bastion of resistance.
The scientists take the children to a top-secret base on the hidden island of Ootorijima known as "Big Falcon", where they reveal to the five Kentaro Goh's greatest life's work and humanity's last remaining hope for survival: the Super-Electromagnetic Robot, "Voltes V".
Though it takes them some time to adjust to the controls, the five are able to work together and save the EDF from total destruction by finishing off Dokugaga with their powerful Heaven Sword, or Tenkuu-ken.
The Boazanians continue with a variety of strategies, attempting to defeat Earth's robust new robot, ever constructing new Beast Knights based on different animals.
The Voltes team train to improve their teamwork and skill, learn more about the nature of the Boazanians and the Goh siblings' missing father.
Imprisoned by the Boazanian empire the entire time, he escapes from their control and attempts to return to Earth with several allies, but is waylaid by a breakaway force and taken prisoner by Heinel's traitorous science officer, Zuhl.
The planet is wholly governed by an oligarchic monarchy with a cruel caste system: Boazanians born with horns are highly regarded and form an aristocratic elite, while the hornless are forced into slavery and worked to death on physically demanding tasks such as mining and construction.
Taking advantage of this fact to further his own quest for power, Zambajil had La Gour imprisoned and exiled his wife Rosalia, causing him great despair.
After learning that Rosalia died while he was forced to work as a common slave, La Gour joined a band of hornless dissidents and subsequently led a daring insurrection against the empire, only to be easily thwarted by their vastly superior military.
Knowing that Zambajil's ambition was to rule a galactic empire, Goh quickly set into motion his plans to protect Earth from their eventual attack, and moreover, to someday finish what he started by returning to Boazan and liberating its oppressed underclass.
Refusing to work for the tyrannical ruler, Goh was once-again imprisoned and nearly executed, only to be saved by the remnants of the rebel army he had created right before his exile.
Just when everyone else believes them to be dead, it is revealed that Goh and Dange have been working on the creation of a massive spaceship known as the Solar Bird, with which they hope to return to Boazan to topple its oppressive government once and for all.
In response to Watanabe's request, he created the rival character, Prince Heinel, who was based on one of the actors in the world-famous Takarazuka Revue.
[18][19] Another English dub, written and directed by William Ross, was produced in Tokyo, Japan by Frontier Enterprises and released in North America in 1983 by 3B Productions as Voltus 5.
[28] Popy also released a Jumbo Machinder version of Voltes V. Standing at over 24 inches in height, the toy featured firing projectile fists and could transform into Voltank mode, which small children could ride on.
[36] After the success of the 1986 People Power Revolution, Voltes V was re-aired on Philippine television from the 1990s to 2010s with a Filipino dub on PTV from 1986 to 1987, ABS-CBN from 1987 to 1988, RPN from 1988 to 1989, IBC from 1989 to 1990 and Hero in 2006 and 2009.