Spy

Superman existed for years before he was finally published in 1938. But his creators, Jerry Siegel and Joe Shuster, those boys from Cleveland, had lots of other material published prior to Superman's debut, all non super hero of course. Yet, their earlier characters were but alter egos, it seemed, to Clark and Lois and Luthor.

Looking at the Spy feature from Detective Comics #14, Lois and Clark are acting out in the characters of Sally and Bart—secret service agents, published months before Action Comics #1. This had to be a daydream for Clark that he didn't have to be meek and mild, and the girl was his to have.