User blog comment:Nobody700/How is he so strong?/@comment-179.110.219.138-20151111013513

The first time Saitama fighted the crab monster, his eyes started emmiting a red light.

The Doctor that fixes the bodyparts of Genos get the same weird light when talking about the construction of new parts that would make Genos stronger than Saitama.

The Car-monster that attacks Saitama on one of the first episodes gets the same weird light in their eyes when talked about his "transformation".

The Founder of the National Academy of Heroes is the father of the kid that was saved by Saitama on the first episode, I think all of those are intertwined somehow...