A manga comic book and anime television series by manga artist Go Nagai, made as a direct continuation of the successful Mazinger Z series. It was aired on Japan in 1974, immediately following the end of the first Mazinger series.

From the island of Bardos in the Aegean Sea comes a new threat to humanity in the form of Doctor Hell and his army of mechanical beasts. However, a new hero stands in his way: Mazinger Z, a giant robot built out of the indestructible metal chogokin and equipped with an arsenal of advanced weaponry. Piloting Mazinger Z is hotheaded teenager Kouji Kabuto, who strives to avenge the death of his grandfather and protect Japan from Doctor Hell's forces.
 
(Source: Anime News Network)

The story is set in modern times, but the twist to the story is that Mazinger is an ancient weapon of the gods, left on earth to battle the evil space gods who have returned to take over the universe. 

Continuation of the successful manga and anime series Mazinger Z, Great Mazinger starts after the defeat of Mazinger Z. Tetsuya Tsurugi is the new protagonist, piloting the powerful Great Mazinger, a creation of the once thought dead Kenzo Kabuto, the father of Koji Kabuto. This time the enemy is the Mycene Empire and its powerful robots.

Duke Fleed is a survivor of the Fleed Planet who is escaped to the Earth, onboard a mysterious "spaceship", where is raised by Dr. Umon as his adoptive son, and known as Daisuke Umon. Years after his arrival, he's faced with the threat of King Vega and his army, who want to conquer the Earth. With his friends Koji and Hikaru (and later his younger sister Maria Grace), Duke decides to fight back using his best weapon - the almighty Grendizer.

Dynamic Heroes is a digital manga by Kazuhiro Ochi that presents the most notable characters from the franchises by Dynamic Productions in their anime format in a massive crossover. It involves the series: Devilman, Mazinger Z, Cutey Honey, Great Mazinger, Getter Robo, Grendizer, Demon Lord Dante and Dororon Enma-kun.

The film is commemorating the 45th anniversary of the original Mazinger Z series.

It has been 10 years since then. Humanity awaits a new fate.

Once humanity was on the verge of destruction at the hands of the evil scientist Dr. Hell and his underground empire. Kouji Kabuto, his Mazinger Z super robot, and his friends at the photon power laboratory put an end to Dr. Hell's evil ambitions, and returned peace to the world.

It has been 10 years since then. Kouji has followed his father and grandfather and now walks the path of a scientist. He encounters a mysterious life form buried in a giant structure buried deep below Mt. Fuji. A new encounter, a new threat, and a new fate await humanity. And Kouji, who was once a hero, makes a decision for the future.

It can be a god or a demon.

Once again the future is entrusted to Mazinger Z.
 
(Source: Anime News Network)

From the far end of the universe, the terrifying space monster Gilgilgan attacks the Earth. The Science Fortress Laboratory and the Saotome Institute both fight against this threat. Distracted by their rivalry, Getter Robo and Great Mazinger are forced to retreat from Gilgilgan's sharp fangs, but once they agree to work together they begin their combined attack!

Great Mazinger starts after the defeat of Mazinger Z. Tetsuya Tsurugi is the new protagonist, piloting the powerful Great Mazinger, a creation of the once thought dead Kenzo Kabuto, the father of Koji Kabuto. This time the enemy is the Mycene Empire and its powerful robots.


Alien invaders take over Great Mazinger who is at the entrance of a museum next to Mazinger Z as symbols of peace. Grendizer fights the evil invaders and Great Mazinger is recovered. 
When the Vegan empire dispatches a new general to oversee the takeover of Earth, he quickly manages to capture Koji Kabuto and, learning of Great Mazinger through interrogation, quickly commandeers it from a museum where it was kept as a symbol of peace. 
It is now up to Duke Fleed aboard Grendizer to stop humanity's former defender from becoming its destroyer.
 
(Source: Anime News Network)

A giant sea monster known as "Dragonsaurus" has emerged from out of nowhere, terrorizing the depths of the oceans. Great Mazinger, Grendizer and the Getter Robo G team join forces to combat the new threat. But their task becomes more complicated when Dragonsaurus swallows up Boss Borot and makes its way towards Tokyo.
 
(Source: Anime News Network)

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