"Superman: Brainiac Attacks" should not be a part of this collection as it is not a sequel to the previous films, or even in the same shared universe. Per the TMDb guidelines "Collections should only be used for true movie sequels."

Per an interview with screenwriter Duane Capizzi: "let me first say that the movie is not intended to be in continuity with the Timm-verse" https://dcanimated.com/WF/superman/backstage/interviews/capizzi.php