The doctor responsible for Genos' repairs and upgrades. He was pursing the cyborg that destroyed Genos' town. Genos begged for him to make him into a cyborg after promising the destroy the cyborg that destroyed his home.


Saitama has a rather peculiar hobby, being a superhero, but despite his heroic deeds and superhuman abilities, a shadow looms over his life. He's become much too powerful, to the point that every opponent ends up defeated with a single punch.
 
The lack of challenge has driven him into a state of apathy, as he watches his life pass by having lost all enthusiasm, at least until he's unwillingly thrust in the role of being a mentor to the young and revenge-driven Genos.


__Non-Anime Roles:__
~!- Aku Aku in "Crash Bandicoot series" (VG) (Japanese) 
- Azaka in "Tenchi Muyo! Game-Hen" (VG) (Japanese) 
- Brain in "Animaniacs" (animated TV series) (Japanese) 
- Professor Jordan Perry in "Teenage Mutant Ninja Turtles II: The Secret of the Ooze" (live action movie) (Japanese) 
- Television in "The Brave Little Toaster" (Japanese) 
- Van Pelt in "Jumanji" (live-action movie) (Japanese)!~

In this new action-comedy, everything about a young man named Saitama screams "AVERAGE,&rdquo; from his lifeless expression, to his bald head, to his unimpressive physique. However, this average-looking fellow doesn't have your average problem... He's actually a superhero that's looking for tough opponents! The problem is, every time he finds a promising candidate he beats the snot out of them in one punch. Can Saitama finally find an evil villain strong enough to challenge him? Follow Saitama through his hilarious romps as he searches for new bad guys to challenge!
 
(Source: Viz Media)

Saitama is a hero who only became a hero for fun. After three years of “special training,” he’s become so strong that he’s practically invincible. In fact, he’s too strong—even his mightiest opponents are taken out with a single punch. Now, the great seer Madame Shibabawa’s prediction about the Earth being doomed seems to be coming true as the frequency of monster incidents escalates. Alongside Genos, his faithful disciple, Saitama begins his official hero duties as a member of the Hero Association, while Garou, a man utterly fascinated by monsters, makes his appearance.

Specials included in the DVD/BD volumes of the anime. They feature original stories written by the series' mangaka, ONE 
 
The first special is titled "Shinobiyori-sugiru Kage" and takes place after Saitama's fight with Mosquito Girl, and it follows Genos as he is persistently and suspiciously prowling after Saitama trying to find out the secret of his strength. Additionally, a mysterious person appears who has a "certain reason" to hold a grudge against Saitama. 
 
2: Hanashibeta-sugiru Deishi 
3: Kojire-sugiru Ninja 
4: Gouin-sugiru Bang 
5: Iroiro Ari-sugiru Kyoudai 
6: Fukanou-sugiru Satsujin Jiken

Kuseno-hakase