Batman & Bill

Batman & Bill is an American documentary film that premiered on Hulu on May 6, 2017. Directed, written and produced by Don Argott and Sheena M. Joyce, the film explores the creation of the Batman, how Bob Kane was accepted as the sole creator, and how Bill Finger was never credited for his work despite creating much of the Batman mythos.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.