Doctor Hell plans a double attack: with the mechanical monster Tsaila he draws Mazinger Z away from the base, and with another robot, Dankel, he attacks the research institute for photoatomic energy.
Baron Ashura hides his male side and explains to the inhabitants of the city that their lives will always be in danger as long as Professor Yumi and Koji continue to fight
Doctor Hell creates a mechanical monster that can be dismantled and recomposed at a distance, Deimos F3, and instructs Baron Ashura to send it to pieces near the research institute for photoatomic energy.
Baron Ashura and the army of Dr. Hell uncover a powerful cannon that once belonged to the Japanese military. Koji and the others attempt to stop them from using the cannon to destroy the Institute.
Dr. Hell develops a gun that can increase an object's size to giant proportions. Baron Ashura uses it on a local student's robotic science project in order to create a giant killer robot to rival the power of Mazinger Z.
The school's winter festival is interrupted by the attack of Baron Ashura's latest mechanical beast. While Aphrodite S does battle against the creature, Koji must fend off Ashura's armored troops as they invade the Kabuto residence.
Mazinger Z is seriously damaged in battle against Baron Ashura's latest mechanical beast, giving the enemy an unfair advantage when the beast makes its second attack.
After destroying an entire city, Baron Ashura issues an ultimatum to Dr. Yumi: hand over the Japanium metal or the rest of Japan will suffer the same fate.
Doctor Hell unleashes the Deviler X1, a mechanical beast capable of aerial assaults. Since Mazinger Z does not possess flying capabilities, Koji must come up with a plan to defeat the Deviler X1 from the ground.
A newly-transferred student who is bullied in school is given the chance by Baron Ashura to take revenge on his tormentors by allowing him to unleash Dr. Hell's latest robotic beast.
Baron Ashura, in the Salus submarine base, destroys many ships with the mechanical monster Balanger M1 and Mazinger Z enters the sea to find out what it is.
Dam-Dam L2, a new mechanical monster, discovers a Japanium deposit on the outskirts of Oniahara and Mazinger Z manages to put it to flight before it extracts the material
Dr. Hell understands that to be as strong as Mazinger Z he has to combine mechanical power with human intelligence and he instructs Baron Ashura to command the mechanical monster Dina V5.
Dr. Hell has three professors kidnapped by the research institute for photoatomic energy making them believe dead, hypnotizes them and puts them in command of the mechanical monsters P1, P2 and P3.
Mazinger Z can't do anything against the new Baras K9 flying monster, so Professor Yumi takes the first plane to New York and meets Professor Smith for advice
The new mechanical monster Rod R2 attacks the city and Koji and Sayaka don't hesitate to leave. The new robot runs on solar energy and Aphrodite A is immediately split in two.
It is the tenth anniversary of the founding of the Research Institute for Photoatomic Energy and a reception is held where major scientists have been invited.
