Talk:Mysterious Beings/@comment-2600:8804:1200:43:F9A4:9847:4754:BCF5-20180928014147/@comment-36557107-20180928043354

Consider this: A threat wipes out everyone, except Saitama. Saitama defeats the threat. Now Saitama is alone and no one is left to repopulate the world. Eventually, Saitama dies of old age. Done, humans have gone extinct. Thus, that threat can/will still be considered God level.

Alternatively, Saitama somehow doesn't die of old age (doubt it) and live forever. He'll still be the only human left. Humanity can/will still be considered extinct.