UFO Robot Grendizer vs. Great Mazinger

Barendos captures Koji Kabuto to obtain information about the Mazinger robots. Under mind control, Koji reveals the history and locations of both Mazinger Z and Great Mazinger, giving King Vega the strategic knowledge needed to locate and seize Great Mazinger from the museum.

After Koji reveals the location under mind control, King Vega sends his forces to seize Great Mazinger from the museum where it was displayed beside Mazinger Z as a symbol of peace. With this capture, Vega gains control of a powerful weapon to use against Earth and Duke Fleed.

Barendos warned Moonbase officials that they would be dismissed and killed if his mission succeeded, showing Vega's ruthless determination to acquire the robot.

After capturing Great Mazinger, King Vega forces Duke Fleed to battle with Grendizer against the now-controlled Great Mazinger. This forces the hero to fight his own ally, creating a desperate situation where Grendizer must stop a corrupted version of a former defender.

The deactivation shot is a special technique suggested by Koji Kabuto that can shut down Great Mazinger's systems. During the battle, Grendizer fires this shot and successfully disables Great Mazinger, freeing it from King Vega's control and turning the tide against the invading forces.

Koji's earlier insights during captivity hint at this tactical solution to the otherwise impossible confrontation.

Even while captured and under mind control, Koji provides crucial tactical information. His earlier insights about the Mazinger robots lead him to suggest the deactivation shot method that allows Grendizer to disable Great Mazinger and break Vega's control over it.

The Vegan Empire seeks to acquire the Mazinger robots to use them as weapons in their conquest of Earth. Great Mazinger represents a particularly valuable prize because it was displayed publicly, making it an accessible target once Vega learns its location through Koji's forced confession.

Boss Borot infiltrates Vegan Commander Gepel's base and damages the facility, which destroys the brain wave machine that was controlling Koji Kabuto and Tetsuya Tsurugi. This intervention ends the mind control threat and prevents further destruction of cities by the controlled Mazingers.

In the fourth chapter titled "Terror of the Two Demons" of the Grendizer manga, Vegan Commander Depel creates a brain-wave machine that controls Koji Kabuto and Tetsuya Tsurugi. This subplot mirrors the main story's danger but occurs through a different technological method than the initial mind control of Koji.

Mazinger Z, Great Mazinger, and Grendizer unite to defeat Saucer Beast Zardan in the final battle. Despite the complex schemes of King Vega, the three heroic mecha robots work together and emerge victorious, marking a conclusive win for the heroes.

The three mecha robots, Mazinger Z, Great Mazinger, and Grendizer, unite against the common threat of Saucer Beast Zardan. After Great Mazinger is freed from Vega's control, the heroes coordinate their abilities to overcome the alien threat together, combining their strengths in the climactic battle.

Koji Kabuto reveals the history and locations of Mazinger Z and Great Mazinger while under Barendos's mind control. The alien technology forces him to divulge this secret information, which becomes the catalyst for King Vega's plan to seize Great Mazinger and turn it against Earth.