Source: comicsvortex.com
3. Movie – Justice League Dark
Comics – Swamp-Thing: The Anatomy Lesson
         Hellblazer: Dangerous Habits
If Justice League Dark actually happens, you should not prepare by buying Justice League Dark comics. They’re fine, you can go ahead and read them, but they are miles from being the best comics featuring those characters.
Here’s a nice double shot of great comic booking. First off, Swamp-Thing #21, Alan Moore’s first big story with the character. The story, The Anatomy Lesson, completely changed the nature (PUN!) of Swamp-Thing as a character. It’s deep and introspective, and really kicked off Moore’s run on the character in earnest.
In addition, check out Hellblazer: Dangerous Habits for the best John Constantine story of all time. In it, John gets lung cancer from all his smoking, and has to work his way out of it in typical Constantinian manner (e.g., being a straight-up jerk to devils until he cons his way into life). It’s beautiful, and you should read the heck out of it.

