Developed from Japanium ore is the super energy, Photon Power. Seeking this energy is Dr. Hell, a madman craving world domination who along with his subordinates Baron Ashura and Count Brocken, commands the Machine Beasts excavated from Bardos Island (believed to be Rhodes) to attack the Photon Power Lab and take it for himself. Meeting the attack head on is our hero, the hot-blooded teenager Kouji Kabuto who pilots the super robot Mazinger Z, constructed by his grandfather Juzo and made from the strongest metal Chogokin Z. But in this battle between Dr. Hell and the Kabuto family, many legends surrounding the Mycenaean Civilization and Bardos Island, as well as the secrets of Mazinger Z remain shrouded in mystery.

Teenager Tommy pilots the amazing super-robot Tranzor Z to avenge its inventor (his grandfather) against the evil mad scientist Doctor Demon.

Behind a gravity curtain floats Kikaijima, a colossal island quarantined since the last world war. It’s a lawless prison junkyard of robot machine superweapons from a forgotten age of massive military might. Upon receiving a warning that the unstable island’s reactors will detonate and possibly vaporize the world in just a few days, the Japanese government awakens Kaiser- the most powerful and destructive robot ever created! Judgment day has arrived when the towering Kaiser rockets-off to the island to engage in a thunderous robot-crushing battle to save the planet!