The heroes of yesteryear are fables.
Passed off as shell-shock hallucinations, the few who encountered them have either stopped believing, or kept quiet for fear of institutionalization. But they are out there, and the day is dawning when the Powers That Be will no longer be able to hide their existence.
Welcome to the world of CAP Comics (a name I toyed around with in middle school when I thought I would become a comic artist). This campaign uses the Mutants and Masterminds 2nd Ed. books.