The groundwork for the series was laid the year before it was published. One of the greatest challenges for Wolfman and Giordano was coming up with a story. Wolfman cited making use of every DC character and creating a plot that was fun to read and filled with surprises as difficulties, as the series needed to sell well; if it did not, it could have caused a disaster for DC. Plotting became easier once a beginning and an ending had been determined and when Pérez became involved. "Crisis on Infinite Earths" was DC's first mainstream maxiseries, which was still a relatively new concept.