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re-intro Golden Age Flash; classic "Flash of Two Worlds" cover; 1st Earth II; Comic Book Impact rating of 10 (CBI)
One of the most important and historic comic books ever published, without which, DC's entire modern Universe may not have come into being. The success of "Flash of Two Worlds" encouraged DC to revive many of its Golden Age characters. Eventually, crossovers between the two Earths would become an annual feature in the Justice League of America comics, beginning with issue #21, "Crisis on Earth-One!" (August 1963), and culminating in the 12-issue mini-series, Crisis on Infinite Earths. The cover itself has become an iconic image, and has been referenced in the covers to Flash v.1 #147 (Sep. 1964), Dark Horse Presents #67 (November 1992), Flash v.2 #123 (Mar. 1997), and Impulse #70 (Mar. 2001), among others.