The movie I have seen already seen are:
- Under the Red Hood
- Son of Batman
- The Batman vs Dracula (I am not kidding. It’s a thing, look it up)
- Year One
- Assault on Arkham
- The Dark Knight Returns (Part 1)
If you have any suggestions other than these, please tell me. Also, the main focus has to be Batman. I might make a list for other DC movies in the future.
Dark Knight Returns Part 2, Batman Beyond: Return of The Joker, also Batman: Mask of the Phantasm should top any list.