Wonder Comics #1                 Wonder Comics #2           Wonderworld Comics #3         Wonderworld Comics #4
              (May 1939)                             (June 1939)                           (July 1939)                               (Aug. 1939)

      
   Mystery Men Comics #1         Wonderworld Comics #5         Mystery Men Comics #2          Wonderworld Comics #6
           (Aug. 1939)                              (Sept. 1939)                             (Sept. 1939)                               (Oct. 1939)

      
   Mystery Men Comics #3           Wonderworld Comics #7         Mystery Men Comics #4         Wonderworld Comics #8
              (Oct. 1939)                             (Nov. 1939)                               (Nov. 1939)                               (Dec. 1939)

                       
    Mystery Men Comics #5             Fantastic Comics #1          
             (Dec. 1939)                             (Dec. 1939)