The end of the month is coming up fast, and HBO Max subscribers are running out of time to catch some of their departing favorites. HBO Max doesn't directly list the films that are on the way out, which is why it's necessary to look elsewhere for that info. To make things easy for you, the Watch With Us team has narrowed down your best options to the three must-watch HBO Max movies leaving in September. Our picks include a fan-favorite comic book flick, a timeless romance and an all-time great sci-fi film from the '80s.