Three talented students of a technical high school, Daisaku, Tetsuya and Hotaru create award-winning robots as part of a school competition. At this time, the evil Derinja race that plans control of all space extends its ambitions to Earth. To combat this threat, Hotaru's father, Professor Mizuki, takes the three robots and modifies them for battle. Albegas, a super robot, is born. (Source: Wikipedia)

The first of Tadao Nagahama's Romance Super Robot Trilogy. (#2: Chou Denji Machine Voltes V, #3: Toushou Daimos) Thousands of years ago, the people of the planet Campbell decided to leave their planet and seek out new worlds to inhabit. One group, lead 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 biomechanical slave beasts is the super-electromagnetic robot, Combattler V and its pilots. (Source: AniDB)

From out of nowhere, a mysterious alien race known as the Boazan Forces has invaded the Earth. A group of individuals specially trained to handle this kind of situation has been unleashed. Kenichi, Ippei, Daijirou, Hiyoshi & Megumi are the pilots of the Choudenji Machine Voltes V (5), Earth's defense against the Boazan and their terrible Beast Warriors. The plot thickens as the Go Brothers discover their true heritage and the truth behind their father's disappearance. Conflicts and mixed emotions hinder the Go Brothers at times but due to their unwavering desire to find their dad, they must go to the place where it all started. With the help of the rebels based on Earth and on the aliens' homeworld, the Voltes Team has another mission, remove the tyrant Zu Zanbajil and liberate the people of Boazan. (Source: ANN)