World's Finest Comics was an American comic book series published by DC Comics from 1941 to 1986. The series was initially titled World's Best Comics for its first issue; issue #2 (Summer 1941) switched to the more familiar name. Michael E. Uslan has speculated that this was because DC received a cease and desist letter from Better Publications, Inc., who had been publishing a comic book entitled Best Comics since November 1939. Virtually every issue featured DC's two leading superheroes, Superman and Batman, with the earliest issues also featuring Batman's sidekick, Robin. Publication history The idea for World's Best Comics #1 originated from the identically formatted 1940 New York World's Fair Comics featuring Superman, Batman, and Robin with 96 pages and a cardboard cover. The year before there was a similar 1939 New York World's Fair Comics featuring Superman but without Batman and Robin because Bill Finger and Bob Kane had not yet created them. The series was initially a 96-page quarterly anthology, featuring various DC characters – always including Superman and Batman – in separate stories. Comics historian Les Daniels noted that "pairing Superman and Batman made sense financially, since the two were DC's most popular heroes". When superheroes fell out of vogue in the early 1950s, DC shortened the size of the publication to that of the rest of its output, leaving only enough space for one story; this led to Superman and Batman appearing in the same story together starting with World's Finest Comics #71 (July 1954). The title often depicted Batman gaining superpowers as a way to avoid having him be overshadowed by Superman. Lex Luthor and the Joker first joined forces in issue #88 (June 1957). A new supervillain, the Composite Superman, was introduced in #142 (June 1964). The story "The Clash of Cape and Cowl", by writer Edmond Hamilton and artist Curt Swan, in World's Finest Comics #153 (Nov. 1965) is the source of an Internet meme in which Batman slaps Robin. Noted Batman artist Neal Adams first drew the character in an interior story in "The Superman-Batman Revenge Squads" in issue #175 (May 1968). The title briefly featured Superman teaming with heroes other than Batman in the early 1970s beginning with issue #198 (November 1970). That issue featured the first part of a two-issue team-up with the Flash. Other characters to appear in the next two years included Robin, Green Lantern, Aquaman, Wonder