After being warped from their universe to that of Mazinger, the Transformers join the fight between Mazinger Z and Dr. Hell's army of mechanical beasts. 

A crossover between Mazinger Z and the Transformers series, with each chapter drawn by a different artist.

Mazinger Z is an alternate telling manga made in collaboration with Gosaku Ōta and Go Nagai, compared to the original and TV Magazine manga by Nagai, this manga was made more in tune with the anime while adding its own original elements.
 
The manga focuses on a plot more similar to the anime starting with Koji checking on his grandfather after Baron Ashura had activated a bomb. With his dying breath, Dr. Kabuto gives Koji the Super Robot Mazinger Z. With the threat of Dr. Hell looming, Koji fights against his Mechanical Beasts and lieutenants with help from Sayaka Yumi and to some degree Boss.

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)

One of the first Super Robot manga and the one that introduced most of the traits of the Mecha genre. Constructed with the Super-Alloy Z, Mazinger was built by Professor Juzo Kabuto as a weapon against the Mechanical Beasts of the evil Dr. Hell. Koji Kabuto, the grandson of Professor Kabuto, becomes the pilot of Mazinger Z when his grandfather is killed, and battles from there on against Dr. Hell and his allies. This is the first series that introduced the concept of a pilot inside a Mecha, which all series from then on have followed.


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)

The autobiographical manga will reveal the untold story of the creation of Nagai's Mazinger Z mecha manga.
 (Source: Anime News Network)

The heroes of the series Mazinger Z and Devilman fighting against the evil Demon Clan.

The manga takes place in a world where the use of Super Robots is questioned. Koji is a former pilot with his companions faced with both personal and outer conflicts. They were once heroes but peace was achieved, bringing their robot's use into question. Can this peace even last and can it even lead to true peace...?

Set in the near future, humanity enters another energy revolution following the discovery of Photon Power. Derived from the ore discovered under the foothills of Mt. Fuji, its intended use was to solve the world's energy problems with its unimaginable power. Seeking this energy is Dr. Hell, a madman craving world domination who with his subordinates Baron Ashura, Count Brocken and Viscount Pygman, commands an army of mechanical beasts excavated from the ruins of ancient Greece to seize the Photon Power Lab for himself. Meeting the attack head on is the hot-blooded teenager Kabuto Kouji, who pilots the Photon Powered robot built by his grandfather, Mazinger 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. 
A new series based on the mecha show that started it all, Mazinger Z. Shin Mazinger Shougeki! Z-Hen starts over from the beginning with a new cast, to tell a new story unrelated to the original show. 
(Source: shin-mazinger.com)

A retelling of the origins of Mazinger Z.

A retelling of Mazinger Z mixed with ancient Greek mythology with a modern touch.


Kouji and his friends have defeated Dr. Hell and are now enjoying a break, but suddenly a strange prophet appears and warns everyone of an oncoming danger, mechanical beasts never seen before start appearing all around the world wrecking havoc. Its up to Kouji and his Mazinger Z to stand up to this threat but it seems he is vastly outnumber and outmatched. 
This film served as an alternative link between the Mazinger Z TV series and the Great Mazinger TV series. It basically introduces Great Mazinger to the audience, as well as his enemies from the Mikene Empire.

Fleeing from the war that has raged on the planet Cybertron for millions of years, the heroic Autobots led by Optimus Prime encounter a surprise attack by the evil Decepticons led by Megatron. The ensuing melee aboard the Autobot ship ends when the ship crashes on a volcano. Four million years later, an earthquake reactivates the ship`s computer and resurrects both the Autobots and Decepticons, resuming the great war of the Transformers. 
(Source: AniDB)

Fight! Super Robot Lifeform Transformers: The Comics collects every issue of the original Generation 1 Transformers manga published in the pages of TV Magazine. Fight! Super Robot Lifeform Transformers Prologue (2 issues, 05/85-06/85) 
Hundreds of thousands of years ago there existed a highly-advanced planet called Cybertron. The planet was controlled by two factions of super robot lifeforms: the heroic Autobots and the evil Decepticons. 
Their endless war drained Cybertron of all its energy, leading to both factions leaving the planet in search of new energy sources. Their battle raged on, eventually reaching the vicinity of prehistoric Earth. Fight! Super Robot Lifeform Transformers (8 issues, 04/86-11/86) 
Trouble is brewing in Tokyo, Japan &ndash; Starscream, Skywarp and Thundercracker are on the attack, out to pillage energy and cause some general destruction. But the Autobots have pursued their foes to Japan, and Optimus Prime, Smokescreen, Wheeljack, Trailbreaker and Sideswipe speed onto the scene, just in time for Prime to transform and save a young boy named Kenji. The Story of Super Robot Lifeforms: The Transformers (5 issues, 12/86-04/87) 
Responding to an SOS, an Autobot team consisting of Rodimus Prime, Ultra Magnus, Kup, Blurr, Springer and Arcee head into space at full speed, and discover the spaceship that sent the call for help held prisoner by another. The Great Transformer War (3 issues, 04/87-07/87) 
(aka Transformers: Big War) 
The Decepticons have captured Dalton, a brilliant scientist from the planet Elan, but he is refusing to work with them, and the Aerialbots and Protectobots are already on their way towards Trypticon to rescue him. "Great Decisive Battle of Planet Beast!" (special, 08/87) 
With White Leo and Rodimus Prime away, the Decepticons and their Beastformer allies make another attempt to conquer planet Beast. Transformers: The Headmasters (8 issues, 08/87-03/88) 
As the Autobots and the recently-arrived Autobot Headmasters ruminate on the current state of play &ndash; the death of Optimus Prime, their base on the planet Athenia, the power of the Headmasters &ndash; Galvatron leads the Decepticon Headmasters in a plot to destroy Battleship Maximus. Transformers: Super-God Masterforce (12 issues, 04/88-03/89) 
(aka Transformers: Masterforce) 
After the events of The Headmasters, the Autobots and Decepticons have departed Earth... or have they? Transformers: Victory (10 issues, 04/89-01/90) 
The Victory War begins as Star Saber and Deathsaurus face-off on Earth! Transformers: Zone (special, 04/90) 
When nine of the most powerful Decepticons are gathered together under the rule of Violen Jiger, Autobot Powered Master Dai Atlas must step forward to prevent them from acquiring the power of the mystical Zodiac. Transformers: The Battlestars (special, 08/91) 
Super Megatron attempts to pillage energon from an oil rig, only to be confronted by Star Convoy! 
(Information collected from Transformers Wiki and TFArchives).

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