Episode 5

The Ultimate Master is the fifth episode of the One-Punch Man anime series.

Summary
Saitama and Genos are finally going to become registered heroes, but first they have to pass a physical and written test in order to prove that they worthy of being a hero. Saitama easily surpasses the physical exam and anyone else that took it. Even though he aces the physical exams, he doesn't do as well on the written part where he only passed the entire portion by 1 point, but Genos gets a perfect score on both and is given an S rank while Saitama is at a C rank.

Saitama and Genos are the only ones who made it out of all the applicants to actually be in a class where Sneck is going to teach the class. Sadly the class A Teacher is too confident in his skills but Genos and Saitama are clearly stronger. Then in class the teacher gets annoyed by Saitama for not paying attention and tries to teach him a lesson, only to embarrass himself. Later that day Genos wants to spar with Saitama because of his newest upgrades. Genos still doesn't believe Saitama's secret training strategy and thinks there must be some other secret that even Saitama himself might not know. Meanwhile Genos is giving it his all in the spar, Saitama is just messing around, not really caring about the fight. So he asks Saitama to give it his all, and right when he does the fight ends without Saitama even hitting him. Then Genos came to realize that Saitama is on another level that even he himself can't pass by just training.

After the training visit an udon shop where they had an eating contest where Genos had no problem completing while Saitama nearly passed out. Sweet Mask suddenly came and requested to speak to Genos outside. Sweet Mask came to congratulate Genos and welcoming him to the team, much to Genos' surprise.

Characters in order of appearance

 * 1) Bespectacled Worker
 * 2) Bearded Worker
 * 3) Saitama
 * 4) Genos
 * 5) Sneck
 * 6) Sweet Mask

Manga & Anime Differences

 * The Hero Association meeting scene is anime original. There was also no indication that Genos was being observed by the Hero Association.
 * Shot Put, Whack-A-Mole and the Punching Machine are anime-only hero tests.
 * Saitama mistaking his C rank for an S Class rank is an anime-only scene.
 * Genos being questioned by the Hero Association about the House of Evolution is anime-only.
 * Unlike the anime, Sweet Mask was not shown being asked to approve Genos' placement in S-Class in the manga.
 * Genos tells Saitama the info about the Hero Association on the walk home. This was done when he first told Saitama about the Hero Association in the manga.
 * Saitama vs Genos is slightly altered, but mostly the same.
 * The aftermath of Saitama's punch in the anime clearly show the damage to the cliff. The large cloud of dust that was in the manga is not in the anime.
 * The udon restaurant scene where Sweet mask meeting Genos was anime-only scene.
 * After the ending, Genos asks to move in is almost the same as the manga. In the manga, Saitama was reading Gokuri Buster (a real one-shot ONE and Murata collaborated on) instead of eating a popsicle.

Trivia

 * Sneck gives the episode monologue at the end of the credits.