Also known as ワンパンマン, One Punch-Man, One-Punch Man or OPM.
This TV series has 12 episodes with each episode lasts for about 24 min. Its original run was from October 5, 2015 to December 21, 2015.
One Punch Man’s genres are action, comedy, parody, science fiction, super power and supernatural. Since it contains violence and profanity, it is rated R – 17+.
Here is one of the One Punch Man videos I found and like: