Batman Begins (2005) Wasn't Supposed To Start A Trilogy

Christopher Nolan told The Hollywood Reporter:

“When we reveal the Joker card, that very much felt like the appropriate ending for Batman Begins,” he recalls. “It wasn’t really about setting up a sequel. I wanted [the audience] to leave the theater with their minds just spinning. Batman has arrived. That was always the snap of the ending. It wasn’t really until months after the film came out that I said, ‘OK, now I want to know who the Joker is.’ ”