35 years have passed since the battle between Brave Raideen and the Demon Empire and all the other Super Robot battles. Peace has continued through the generations where Reideen has become a long forgotten legend, that is until the peace is disturbed once again from the appearance of 2 Fossil Monsters.
 
Amongst the continuing screaming by the powerless citizens, an eighth-grader girl hears a mysterious voice from a great titan. The girl's name is Akira Saezuri who heard the voice of Akira Hibiki, the legendary pilot of the titan Reideen. Thus a new battle begins.

After a slumber of 12 millennia, the Demon Empire returns to seize control of the Earth. Reideen, the giant robot-like protector of the lost continent of Mu, senses the evil presence and awakens within its golden pyramid, revealing to young Japanese boy Akira Hibiki that he is the one descendant of the ancient Mu people who must help Reideen save Earth. 
He was assisted by his friends, token girl Mari Sakurano (daughter of a scientist fighting the Demon Empire) and several members of his high school soccer team. 
(Source: AniDB)

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)

It is the year 1995. Earth has been conquered by an alien army from the Saar cluster known as the Akron. The cities of Earth have been destroyed, and the remaining survivors live in harsh shanty towns and villages. Kento, a war orphan, hides within a cave along with his companions in order to escape some bandits. In the cave, they find the secret base of Dr. Earl, who was an inhabitant of the planet Helios, a planet conquered by the Akron. Dr. Earl then fled to Earth, bringing with him the greatest achievement in Helian technology: the super robot Daltanius, whose power is increased when combined with the intelligent lion robot, Beralios. Dr. Earl entrusts the fight for Earth to Kenta, who happens to be a descendant from the long disappeared Helian royal line. 
(Source Wikipedia.org)

The third of Tadao Nagahama's Romance Super Robot Trilogy. (#1: Chou Denji Robo Combattler V, #2: Chou Denji Machine Voltes V) 
After the destruction of their homeworld, the survivors of the planet Barm head towards Earth with the goal of negotiating the purchase of land to emigrate to. Unfortunately, during the negotiations, the Barmian&rsquo;s leader, Leon, is assassinated by his second in command, Olban, and the delegation from Earth is framed for the murder. In the ensuing chaos, Doctor Isamu Ryuuzaki of the Earth delegation is shot and killed. 
Shortly after the disastrous end of the talks, the Barmians (called &ldquo;Valerians&rdquo; in Starbirds) begin a campaign of terror against Earth, lead by Leon&rsquo;s son, Admiral Richter, who deploys a variety of &ldquo;Mecha Soldiers&rdquo; against the planet&rsquo;s defenses. The only thing standing between the Earthlings and annihilation is the transforming, karate-using super robot, Daimos and its pilot, Kazuya Ryuuzaki. But that changes when he meets and falls in love with a mysterious girl named Erika, who turns out to be Richter's sister. Over the course of their struggles to reunite, Kazuya and Erika each learn that the other&rsquo;s people are not all evil...and that their own people are not all good. 
(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 &amp; 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: Anime News Network)

The crossovers of "Chou Denji Robo Combattler V", "Chou Denji Machine Voltes V", and "Toushou Daimos".

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