Detective Comics
Detective Comics is an American comic book series published by DC Comics. The first volume, published from 1937 to 2011 (and later continued in 2016), is best known for introducing the superhero Batman in "Detective Comics" #27 (cover dated May 1939).
Batmania
Kane's 6-page letter (reprinted by Roy Thomas in the pages of "Alter Ego", as published by TwoMorrows Publishing) was written on September 14, 1965, and after congratulating White on "Batmania" aims to rebut the various "myths" surrounding the creation of Batman. Opening his attempts to "explode the myths" about the creation of Batman, Kane writes:
The letter sparked a debate among comics fandom over the contributions made by Kane, Finger and Jerry Robinson (among others), a debate that continues to the present day. The letter itself, while much less charitable towards Finger than Kane would later be, appears carefully worded to rebut "the impression that "he" [Finger] and not myself [Kane] created the "Batman," as well as Robin[, etc.]" rather than to address Bails' issue of co-creatorship. Part of Kane's logic hinges on Finger's signature/by-line not appearing on the strip, even though such anonymity and relinquishing of credit was commonplace in the comics industry of the 1930s and 1940s. Kane further threatens legal action against Jerry Bails, asserting that, while Finger "was influential . . . in shaping up the strip", the idea was conceived solely by him prior to bringing Finger in to script the work, and therefore was created solely by him. "Batmania" – and other forums – have since debated whether the "influential" assistance of Finger was deserving of more credit than Kane was – at the time – willing to apportion him.