Regardless of your feelings about the DC Extended Universe, they have a whole bunch of proposed movies coming up that they're committed to making. And everyone likes to do those Ten Comics to Read Before You See X Movie lists (I'll probably do a few myself). But I wanted to do something slightly different. I just wanted to give you some stories to read that are good. These aren't designed to get you ready for the movies, or to give you a crash course on the characters. These are just some good-ass stories that you should read. In general.
10. Movie – Justice League
Comic – Justice League: Year One
Justice League: Year One is a retelling of the JLA's first year of existence, when it was formed without Superman, Batman, or Wonder Woman.
So the new team – composed of Green Lantern, Flash, Martian Manhunter, Black Canary, and Aquaman – deals with various threats and challenges. It's also a book that is driven firmly by characters. It contains my favorite depiction of Aquaman ever in any form. Also Barry Allen at his typical Waid best.
Martian Manhunter also comes out incredibly, which is shocking, since I never really liked the character before this story. Black Canary is also a scene stealer with a very clearly defined character. Green Lantern's pretty great too. The cameos in this one are also phenomenal. Doom patrol? For reals?
Seriously, though, this is the best single story to introduce people to the JLA. It's great and tense and funny. Read this one, and not the New 52 League. This is where you wanna start.