Mystery Of The Human Thunderbolt! (SHOWCASE #4) Carmine Infantino & Joe Kubert Carmine Infantino & Joe Kubert Cover (FLASH ORIGIN FIRST APPEARANCE FIRST DC SILVER AGE HERO SEPTEMBER OCTOBER 1956 FIRST APPEARANCE IRIS WEST FIRST APPEARANCE THE TURTLE REPRINTED IN SECRET ORIGINS #1 1961 1973 FLASH SHOWN READING GOLDEN AGE FLASH COMICS #13)