Reviews for the first season generally fall in the range, with this episode specifically noted for setting the series' signature tone of absurd comedy mixed with top-tier action.

“Saitama and Genos' conversation was perfectly done. Especially the long backstory. Saitama vs Beast King was great. Timing and animation was really good.” Reddit · r/OnePunchMan · 10 years ago

: The episode introduces Genos and his "perfectly done" long backstory, which parodies typical dramatic anime monologues.

: Reviewers often prefer the anime's version of the fight against Mosquito Girl , noting that the "arm/leg exchange" and final blood splatter were more impactful than in the original manga.

: Fans often highlight the comedic irony of Saitama—who can destroy galactic threats with a single blow—struggling and failing to swat a simple mosquito.

Season 1, Episode 2 of (titled "The Lone Cyborg") is widely considered a solid expansion of the show's world, famously introducing the cyborg Genos. It is praised for its high-quality animation and the humorous dynamic established between Saitama and his self-appointed disciple. Episode Highlights

: This encounter is frequently cited for its excellent timing and animation. Community Impressions