What is it?
The 2015 Japanese anime (animated) TV show One-Punch Man (Season 1).
What is it about?
This is how Amazon Prime Video describes this anime (animated) TV show:
Saitama only became a hero for fun, but after three years of “special” training, he finds that he can beat even the mightiest opponents with a single punch.
Though he faces new enemies every day, it turns out being devastatingly powerful is actually kind of a bore. Can a hero be too strong?
My brother GC and I saw this back when it came on Toonami, we did not know what to expect, but I ended up liking it better than I had expected.
They somehow managed to make a show with an overpowered character work better thank you would expect.