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

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)

Following an accident in the Himalayas, Akira Fudou's body has been taken over by none other than the fearsome demon, Devilman. However, upon living with Akira's relatives, Devilman has come to find himself rather fond of humanity - even if it means getting roughed up by his girlfriend, the Most Dangerous Miki Makimura for acting out, much to the Demon Lord Xenon's dismay. Wishing to kill the traitor, Xenon begins unleashing a series of cruel, grotesque demons unto Earth, and only Devilman stands between them and humanity's demise. Can the reluctant hero save his soul while keeping the city and his secret identity safe? 
(Source: Discotek Media)

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.

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