This is a classic episode, remembered well by those of us who have watched this show for many years. Herman becomes "The Masked Marvel," a wrestler. He's doing it to put extra money in the bank for Eddie's college fund.
It came about when Eddie had a friend over, Wilbur, and Herman wowed the kids with exhibitions of his strength. Wilbur's dad is a wrestling promoter, hears about Herman, calls him and invites him to be a wrestler.
Herman accepts, but wants to keep it a secret. Only Grandmpa knows what his "night job" really is, and the rest of the family winds up watching, unknowingly, on television.
Herman's first bout is with Tarzan McGurk. It winds up like his next seven with Herman's soft heart ruining his record.....but his face saving him in the end!