Grecios was a SuperHuman Warrior Beast and the Monster of the week featured on Ep. 7 of the Great Mazinger Anime under the command of General Julicaesar. He was noticeable for its near identical resemblance to Mazinger Z, with the differences been his true face was located on the top of the head instead of having a Pilder, had a double bladed Driller for a left hand, a cage in the stomach with inner over heating apparatus, his eyes were oval in shape rather than rectangular and had a operable working mouth. His color scheme was largely Blue, with Red, Purple, and light Green. Grecios could fly with jet boosters located on the bottom of its feet, burrow underground with the left double bladed driller and fire yellow lasers from its eyes and a Pink laser from the sphere in the forehead which freeze projectiles and enemies on the spot. As well, he could hold prisoners on a cage in the stomach with the access point been via the mouth and use the prisoners as Humans shields.

The episode (with a great deal of cringe I must say) revolves around one of Shiro's class mates, Shinichi, who proclaims to have a giant robot and shows them a drawing, likely to sound cool in front of the other kids. The rest of the kids call him liar, Shinichi sticking to his Robot story, promising to show them tomorrow and a scuffle ensues between him and Shiro, unbeknownst to them, Archduke Gorgon witnesses this and reports back to the Great General, showing the image of Shinichi's Robot drawing, it resembling the Warrior Beast Grecios and the Great General orders Julicaesar to take it on the mission.

How does this sort of coincidences happen you ask? … ITS ANIME! Like melon size Boobs, its a fucking trope, what else?!

Next morning, the whole class arrives to Shinichi's home for the dare of his life, the fucking brat begging God to have the Robot showed up cause he didn't want to apologies in front of Shiro (in some parts that would be called Devil's bargain, but in Japan is called “Tempting Fate”, Son!). So the little dweeb goes to the park with the other kids, when the Mikelos among the clouds and Grecios is launch, burrowing its way to the park, coming out from the ground and grabbing Shinichi, swallowing him. Tetsuya arrives, with Shiro, and sees the Beast and Shinichi and calls for help. The beast attacks with its Optic lasers, blasting a highway bridge with the two of them falling. Jun launches Venus A, Bakarasu the Crow witnesses this and warns the Borot Gang, through which he gives a message to Jun, which the little feather bastard gives her as an insult, of course.

On its way to the Lab, Grecios encounters Venus A and the monster repeals her Rockets – Jun then notices the child in the stomach and she halts her attack, when a romantically deluded Boss arrives (again, thanks to the feather little bastard because he told him Jun would go out on a date with him if he defeated the Beast) to further complicate matters, and Grecios beats them, continuing its march to lab. Meanwhile a rescue team finds Shiro and Tetsuya, who wakes up and rides to the lab. Grecios arrives and Julicaesar demands Kenzo surrender the facility or he would burn the child alive (which off course he still does). Kenzo agrees to surrender, when Tetsuya arrives and launches Great Mazinger.

As Great distracts Grecios, Borot and Venus grab it and tossed, with Venus blasting its right leg. Great tries to restrain the Beast, but it begins to burn the kid. Looking at the situation, Tetsuya thinks of rescuing the child by other means, Borot and Venus withdraws, and Tetsuya jumps from Great onto Grecios head via the back and crawls forward, but is detected by Julicaesar. Tetsuya reacts and stabs the Eye and Forehead (Somehow doing this busts the Oven). Venus A grabs and carries Tetsuya back to Great and the Mecha dashes towards the Beast, avoiding the yellow laser. Great unleashes the Great Sword and slices the monster's stomach off with two swings of it, with Borot grabbing the Cage and taking the child to safety. Grecios freezes Great, but is blasted in the face with one of Venus' Rockets, Great finishes what's left of the Monster with Thunder Break. A furious General Julicaesar vows revenge for this defeat. Afterwards Shinichi apologies for his lies to Shiro and the two become fast friends, as Boss is left once again with a broken heart, realizing he fell to one of Bakarasu's little pranks.