A key issue noted for First appearance of Professor Zoom (Reverse-Flash) and Origin of Professor Zoom. The Flash #139 was published by DC Comics on September 1, 1963, as part of a series that began in 1959. John Broome and Paul Kupperberg write, and art comes from Carmine Infantino, Joe Giella and Murphy Anderson. This 36-page issue features Barry Allen, Iris West Allen and Eobard Thawne.