The third season of One Punch Man. 
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. Alongside Genos, his faithful disciple, Saitama performs his official hero duties as a member of the Hero Association. 
One day, monsters claiming to be from the Monster Association suddenly appeared, taking a child of Hero Association executive hostage. The S-class heroes gather and plan a raid on the Monster Association hideout to rescue the hostage. Meanwhile, Garou, a "human monster" who was taken by the Monster Association during a battle with the heroes, awakens in the Monster Association hideout. 
(Source: EMOTION Label YouTube Channel Description) 
Note: Excludes recap episode that aired a week before regular broadcast.

J.C.STAFF

Bandai Namco Filmworks

TV Tokyo

ADK Marketing Solutions

JR Higashi Nihon Kikaku

Shueisha

Bandai Namco Music Live

BANDAI SPIRITS

Good Smile Company

Action

Adult Cast

Comedy

Parody

Seinen

Super Power

Casts: Furukawa, Makoto, Hayami, Saori, Ishikawa, Kaito, Midorikawa, Hikaru, Onosaka, Masaya, Sakurai, Takahiro, Tsuda, Kenjirou, Yamaji, Kazuhiro, Yasumoto, Hiroki, Yuuki, Aoi

Nonton Anime One Punch Man Season 3