Flashy Flash/Other Media

Tatsumaki's Day Off
During Tatsumaki's free day, Flashy Flash defeated a Demon-level monster.

The Murder Case That Is Too Impossible
Flashy Flash and the other S-Class heroes were invited to a hot spring resort, after the Dark Matter Thieves failed invasion. At the host springs, he was questioned by Metal Bat about his absence during the invasion, but Flashy Flash states he was fighting other monsters. The next day after the ceremony, the heroes find Zombieman murdered, stabbed in the back by Atomic Samurai's katana. During Child Emperor investigation, Flashy Flash was suspicious of Metal Bat statement of not drinking, but Metal Bat defends himself, stating he is not a morning person. While the investigation wasn't progressing, Tatsumaki tried to restrain everyone, until Zombieman suddenly woke up. Zombieman later revealed that Atomic Samurai's katana was floating with green light surrounding it similar to Tatsumaki, when it stabbed him. Zombieman didn't care what happened the night prior and the heroes disbanded and dropped the case.