The Batman Year One and the Dark Knight Returns movies are based off of the graphic novels of the same name by Frank Miller. They're both fantastic additions to the Batman mythos, if not two of the supporting pillars, and the movies are nothing short of amazing.

The Dark Knight Returns was directed by Bruce Timm, who was one of the helping hands that made the Batman Animated Series as awesome as it was and still is. Dude's doing comics justice with his animated features.

Year One had a great cast. Ben McKenzie, who plays Jim Gordon on Gotham, played Bruce Wayne in his first year as Batman, and Bryan Cranston plays Detective Gordon.

These movies are great, and if you are a comic book fan I suggest you watch all of the recent Justice League movies. These animated features are on par with what Marvel is doing with their cinematic universe.