Grendizer, Getter Robo G, Great Mazinger: Kessen! Daikaijuu!

On a solitary island in the middle of a vast unknown ocean, Dr. Hell, a deranged genius, plans the final stage of his plan for world domination: the activation of his Mecha Beast Army. The only man aware of Dr. Hell's plan is Dr. Kabuto, a pioneer in new energy sources. In a desperate attempt to stop Dr. Hell before his death, Kabuto uses his research and resources to construct a weapon powerful enough to match that of the Mecha Beast Army, which he entrusts to his grandson, Kouji Kabuto. That weapon is the Super Robot Mazinger Z!

Professor Saotome is finishing up his lifelong Getter project: a series of space exploration ships powered by Getter rays from the sun. These ships are able to combine into three different robot forms called Getter Robo. At the same time, King Gora of the underground Dinosaur Empire has completed his mechasaurus project and begins his plans for world domination! Can Getter Robo’s pilots Ryoma, Hayato and Jin defend the earth from the forces of the Dinosaur Empire, even with the help of the lovely Michiru from the Command Ship?

Alternate titles: Muteki Choujin Zanbot 3

Kappei is your normal run of the mill delinquent lad, riding motorcycles and trying to gain leadership of a gang. When fighting with a rival, they are both attacked by a strange creature! Fleeing to his Grandfather's nearby sea rig, Kappei is knocked into the water and is rescued by a giant spaceship piloted by his grandparents. Before he can figure out what is going on, he finds himself in the mighty Zam-bird, fighting against the monster that attacked him - a mecha-boost of the planet-destroying Gaizok! Kappei isn't the only one in his family who ends up with a giant robot, though; his cousin Uchuta pilots the Zambull and Keiko pilots the Zambase. Together, the three of them can transform into the Invincible Superman Zambot 3!

Alternate titles: Choudenji Machine Voltes V

Evil aliens known as the Boazanians have invaded Earth, easily defeating all of its conventional military defenses. However, all is not lost: Japan has been secretly developing a mighty weapon – the powerful robot known as Voltes V! This massive mecha is made up of five combat vehicles, three of which are piloted by the sons of Voltes V's inventor; and when the evil Boazanians attack, the five vehicles combine to crush the invaders’ newest evil plot while using their mighty laser sword to slice the enemy robots in two!