Eizo is the second person to be known as Doctor Crab. He's the son of original Doctor Crab who fought against Senshudan One and the Seven Heroes during the eighties. Eizo was his fathers' sidekick, and he used the code-name: Number One Son. Doctor Crab, used his bio-technical soldiers which he called his Crab Men to steal technology all across Japan. Using his super-science, Doctor Crab even gave himself uber-human powers. His defining mutation was to give him a human sized crab's arm.

Eizo's father died in a climatic battle with Senshudan One in his secret volcano lair. Sensai Progress Green triggered the self-destruct system in the volcanic lair, and Eizo's father was buried under tons of molten lava. Eizo made his escape in one of the crabmursibles.

Since Eizo was only a side kick to the original Doctor Crab, Senshudan One gave no mind to Eizo, they were off onto their next crime fight, and he was quickly forgotten. Eizo didn't forget about them however. He plotted his revenge against the heroes who killed his father.

Eizo went into hiding, eventually migrating to Singapore. It was while in Singapore that Eizo came into the employ of Evol Khan, as a resident mad scientist. Eizo worked for the criminal mastermind for several years, learning the trade at the hand of a master. However, due to Eizo's arrogrance he made no attempt to learn Mandrin Chinese.

It was the death of the original Senshudan One that brought Eizo back to Japan. Eizo had decided to try his hand at being a mastermind like his father, and Evol Khan. Using his father's secrets, Eizo recreated the Crab Men. In other secret lairs Eizo gathered up the fiendish devices created by his father, and even made a few improvements to them. His ultimate change, was when he too used his father's secrets to mutate himself. Now a new Doctor Crab threatens Japan. Will the new Senshudan One be enough to stand against him.

Eizo is an arrogant man, just like his father before. It was his father's arrogance that was his undoing. Eizo is blind to this character flaw in himself. He sees himself as the worlds' greatest scientist. Ethics of course plays little in Eizo's mindset. Only Vaterschmerz is probably the only other person who might understand Eizo. Eizo doesn't suffer fools, and likes to point out the weakness of his foes to them, usually followed by manical laughter.

Eizo keeps a place in his heart for his lost father, whom he worshiped. In all of his secret lairs, Eizo keeps a shrine for his father. Eizo has dedicated his life to becoming an even more powerful Doctor Crab. This dedication has made him sacrifice a part of his humanity by mutating himself. For Eizo the change was a small price to pay for greatness.

Other super-villains in Japan are keeping a close eye on Eizo. They know how great his father was, and they remain to be convinced of this new Doctor Crab. However, his biggest supporter has been Evol Khan.

"My father once was the greatest scientist in Japan. Now Japan and the world will tremble at the scientific greatness of the New Doctor Crab. Mwa haa haaa!"

Doctor Crab is a typical mad scientist type super-villain. He carries around an assortment of fiendish devices that were originally designed by Ezio's father. One of his most diabolical devices is a ray gun that can turn people into Crab Men, at least for awhile. Doctor Crab is constantly changing his weapons from caches all across Japan. Of course, Eizo being a great scientist isn't above modifying his fathers inventions.

Doctor Crab has mutated himself, and is now stronger, faster, and more resilient that an Olympic athlete. However, his most striking change, is that now his left arm is like a crab including powerful pinchers. Doctor Crab can shred steal with his pinchers. The arm is armored, and in certain situations, Doctor Crab can use it as a makeshift shield. Doctor Crab has also built a Hyper-Oscillating pincher attachement, which allows him to unleash a devistating sonic attack by clicking the pinchers together rapidly.

Doctor Crab is a muscular Asian man with a human-sized crab arm where his left arm is supposed to be. Ezio is a balding man with light brown eyes. He's also majorly farsighted, and wears thickglasses. Doctor Crab's usual costume is a trench coat, with a torn sleeve to allow his crab arm free. They don't make trench coats to fit a man with a crab arm.

Because of his mutation, Doctor Crab doesn't try to maintain a secret identity. Instead Doctor Crab is always on the move, from one secret lair to the next.