One-Punch Man Episode 4: The Modern Ninja

A group of bald men led by a large man named **Hammerhead**, calling themselves the Paradisers, march through the city streets ranting about creating a utopia by redistributing wealth from the rich and ending overwork, but passersby ignore them. They don battle suits and head to destroy an apartment building owned by a wealthy man named **Zeniru**, smashing it to pieces before realizing it's the wrong target.

Meanwhile, news reports label all bald people as terrorists due to the Paradisers' actions, frustrating **Saitama** as he shops. Elsewhere, hero **Mumen Rider** on his bicycle confronts the Paradisers but gets easily knocked aside by their suits. **Zeniru**, in his building topped with a golden statue, hires his bodyguard—a fast-moving ninja named **Speed-o'-Sound Sonic**—to eliminate the threat.

Sonic intercepts the Paradisers en route to Zeniru's real building, warning them that no one survives fighting him. When they attack, Sonic swiftly beheads nearly all of Hammerhead's bald followers in seconds with his blades. Hammerhead remains, powering up his suit to hurl boulders and trees at Sonic in a trap, but Sonic dodges effortlessly, stabs him in the head with a dagger, and forces him to flee naked into the forest after stripping his damaged suit.

In a lab, **Genos** undergoes repairs from prior damage by **Dr. Kuseno**, recounting how Saitama saved him twice and suggesting they both register as heroes; Genos eagerly agrees to become Saitama's disciple if he does. Saitama, heading home through the forest, encounters the fleeing Hammerhead, who attacks with his powered suit but takes no damage; Saitama punches the suit apart, leaving Hammerhead naked, then tells him to run away without killing him.

Sonic arrives, mistakes Saitama for a Paradiser due to his bald head, and launches a flurry of shurikens and sword strikes, which Saitama casually catches and breaks. Saitama blocks Sonic's final charge, accidentally punching him in the groin with a stationary fist as Sonic crashes into it. Injured but defiant, Sonic demands Saitama's name, declares himself his rival, vows to train until he can defeat him, and retreats.

Finally, naked Hammerhead is cornered by two mysterious men in freaky suits who beat him down, revealing they allowed the suit theft to gather data and must eliminate witnesses for their Organization; Hammerhead survives due to his thick skull.