The films are usually stand-alone projects that are either adaptations of popular works or original stories. From to , the DC Animated Movie Universe was a sub-series featuring several movies that took place in a shared universe, influenced predominantly from The New They are usually made for an older audience compared to the DC animated universe and other projects, and also featuring DCAU alumni such as Bruce Timm , who mainly served as executive producer or as producer until Batman: The Dark Knight Returns , before returning since Justice League: Gods and Monsters. Since it first began with 's Superman: Doomsday , the series was well received being praised by fans, critics, and had consistently good sales. Unlike earlier animated DC films most of which also involved Bruce Timm and were part of the DC animated universe , the films in the line are aimed at a more adult audience, often containing profane language, stronger violence, sexual scenes and more mature themes. The art styles for the films are also generally more realistically proportionate.