UFO Robo Grendizer tai Great Mazinger

Synopsis

After alien invaders seize control of Great Mazinger—displayed at a museum entrance alongside Mazinger Z as emblems of peace—Grendizer engages the hostile forces and ultimately reclaims the stolen robot. When the Vegan empire sends a fresh general to oversee the conquest of Earth, he swiftly captures Koji Kabuto. Through interrogation, he discovers the existence of Great Mazinger and promptly seizes it from the museum where it was enshrined as a symbol of harmony. Now Duke Fleed, piloting Grendizer, must prevent humanity's once-guardian from turning into its annihilator.