Bad/Other Media

Omake 1
After Sweet Mask kills the hostage aliens and proceeds to leave, Metal Bat stops him and prepares to fight. Suddenly, both their phones start ringing, and while Sweet Mask ignores his, Metal Bat answers his. Metal Bat's little sister is on the phone, and tells him she placed third in the piano concert, with Metal Bat tearing up with joy. As Sweet Mask decides to leave, Metal Bat asks him for an autograph for his sister.

One-Punch Man Holiday Special Chapter
When asked what his plans are for Christmas, Metal Bat replies that he will take his little sister to a theme park.

Weapon
One year ago, Metal Bat finishes off another monster, but breaks another one of his bats. He is later told that he is being promoted to S-Class and that he can be given whatever he wants. Metal Bat asks for a metal bat that will not break no matter what. When he gets home, he is scolded by his sister for not getting Sweet Mask's signature.

The Murder Case That Is Too Impossible
Metal Bat and other S-Class heroes are invited to a hot spring resort, after the Dark Matter Thieves failed invasion. While enjoying himself at the hot spring, he Metal Bat declares he is dissatisfied with the fact that Flashy Flash, Watchdog Man and Pig God did not participate in the battle, but were still invited to the resort and questions their whereabouts. The next day after the ceremony, the heroes find Zombieman murdered, stabbed in the back by Atomic Samurai's katana. Metal Bat is questioned by Child Emperor who is investigating the case. Metal Bat defends himself stating he had not drank any alcohol since he is underage, but his statement rose some suspicion from the other heroes, especially Flashy Flash. When the investigation stops progressing, Tatsumaki tries to restrain everyone, until Zombieman suddenly wakes up. Zombieman reveals that Atomic Samurai's katana was floating with green light surrounding it, similar to Tatsumaki's, when it stabbed him. Zombieman says he does not care for the night prior and the heroes disband and drop the case.

Zombieman Murder Case 2
Metal Bat, Child Emperor, Zombieman and Superalloy Darkshine are dispatched to a forlorn, snowy mountain to hunt a monster. They fail to find anything, so they check into a lodge for the night. There they meet Saitama and Genos, who also got stuck on the mountain and had to check in, and Flashy Flash, who is trying to relax on a vacation.

Eventually, Speed-o'-Sound Sonic breaks into the lodge while trying to hunt for Saitama, and starts a fight with Genos, which causes a blackout. The heroes grab a flashlight and head to the den, finding the room destroyed and Zombieman unconscious. They assume the monster must be responsible, but after the Hero Association tells them it is just a bear monster called Bruinado, they decide it cannot be.

Once Child Emperor sees Saitama sneeze again, he deduces the following: the abundance of heaters in the lodge dried out the interior, Genos and Sonic's fight kicked up flammable dust, Saitama's sneeze pushed the dust into the den, all the electricity being used caused a breaker to trip, and Zombieman's lighter caused the dust to detonate. The group is relieved at the conclusion.

Suddenly, Bruinado crashes through the front door - however, he is quickly defeated by the abundance of S-Class heroes.

Genos, Training
Dr. Kuseno develops Virtual Genocide System (VGS), a headgear that reads brainwaves and simulates battles between the wearer and monster data stored in VGS. You picture how you fight in your head and VGS will carry it out in the simulation, the resulting battle is visualized on an external monitor. Genos uses these simulated battles to gauge his abilities and gain experience. The events in the audio drama take place before Genos’s encounter with Gouketsu, as in the episode Genos claims Carnage Kabuto was the strongest monster he faced. Given the release date and small details in the dialogue, like how characters refer to each other, Japanese fans are saying it's Genos post-G4 upgrade.

Genos contacts HA and sent out a call for powerful heroes to gather at the HA headquarters to get more reference data for VGS. The following four heroes agree to participate:


 * Sneck: It can’t be helped, as your hero senpai I have to help you out
 * Zombieman: This would be interesting data for future reference
 * Metal Bat: Sounds like fun
 * Darkshine: Would be a good work out

The heroes engage in simulated combat vs. Carnage Kabuto. Metal Bat vs. Carnage Kabuto Metal Bat lasted 3 minutes and then lost. Carnage Kabuto is in Carnage Mode. VGS terminates the simulation after it deemed Metal Bat’s injuries too severe to continue, Metal Bat argues that those injuries would not stop him in real life, and that his fighting spirit will revive him, implying VGS isn’t properly simulating his fighting spirit.

One Punch Man: A Hero Nobody Knows
Metal Bat is a playable character in the video game, One Punch Man: A Hero Nobody Knows.