Yes I’m power scaling, fuck you.
If Viltrumites (from invincible) invaded the OPM universe, how much effort would Saitama have to put in to defeat them? Each and every one of them basically scales the entire universe, so I can’t imagine he’ll be able to one shot all of them, but would they give him the fight he’s looking for?
Saitama’s whole deal is he’s the most powerful of all. He’d teleport behind them and obliterate them