Milton "Bill" Finger was an American comic strip, comic book, film and television writer who was the co-creator of the DC Comics character Batman. Despite making major contributions as an innovative writer, visionary mythos/world builder and illustration architect, Finger was often relegated to ghostwriter status on many comics—including those featuring Batman, and the original Green Lantern, Alan Scott.

The Joker is a supervillain appearing in American comic books published by DC Comics. Created by Bill Finger, Bob Kane, and Jerry Robinson, the character first appeared in the debut issue of the comic book Batman on April 25, 1940. Credit for the Joker's creation is disputed; Kane and Robinson claimed responsibility for his design while acknowledging Finger's writing contribution. Although the Joker was planned to be killed off during his initial appearance, he was spared by editorial intervention, allowing the character to endure as the archenemy of the superhero Batman.