|Episode 7 - The Ultimate Disciple|
Genos is called for a 'threat level Dragon' problem when a meteor is about to hit a city... him and the other class S hero Metal Knight both fail to take it down, and then Saitama comes in and destroys it... but that still results in the city taking a ton of damage. Later, a couple of heroes start harrassing Saitama and making everyone think the city's destruction was his fault... Saitama just doesn't care and says he'll continue to be a hero anyway, even if everyone hates him. Genos comes and sees this, and is amazed at what a great hero Saitama is.
Episode 8 - The Deep Sea King
The story is all just serious business by now... the other heroes are all struggling to fight this incredibly powerful seafolk monster... Saitama doesn't even get involved until right at the end.