OK, maybe a little background? DC Comics has a long history of using a single comic book title to introduce new characters and concepts in two or three issues, like "Showcase" which introduced the silver age Flash, Green Lantern, and Justice League. Think of it as a try-out book. The point of these books was never to create a single storyline or set of characters that overlapped, but rather to test the waters to see if a new character or set of characters would be viable.
Oh, and 'First Issue' was a marketing ploy intended to boost sales. the first issue of any successful comic (like Action Comics) would be 'collectable' and therefore it would be valuable.
So, 'Danger Street' culls those 13 issues of unconnected characters, concepts and settings and weaves them into a dramatic tale that is both cosmic and street-level. Established characters like Metamorpho and Dr Fate are now lumped in with 'Lady Cop' (Tom King actually does a great job of handling this misogynistic moniker), the Green Team, and the Dingbats. Mr King also modernizes the character concepts in ways that might not hold perfectly true to the characters we remember or to their ethos, but he does it in a way that invites the reader to more fully relate to the characters and to understand their relationships.
