Board Thread:General Discussion/@comment-24319911-20160701130131/@comment-58.179.182.233-20170929102426

Blast is future Saitama, who punched a hole through space time continuum to save the past (i.e. inspire Tatsumaki, the hero association), because he knows all the past events.

In the future Saitama (as Blast) is finally a popular super hero with hair, and he'll have all the cools things like Metal Knight's robot legion and Genos as the leaders of his awesome army.