The DCU continues to grow at a rapid pace. While the Blue Beetle will be the first character of the DCU, Superman: Legacy will be the first film. The movie will work as the origin story for both Superman and for the entire new DC universe. This explains why Vanity Fair has confirmed that Guy Gardner, Hawkgirl and Mr. Terrific have all been cast in the upcoming film. These characters will help to make the world that Superman enters feel for alive, letting him jump into an active universe instead of starting from scratch.
Source：https://www.cbr.com/superman-legacy-hawkgirl-gardner-terrific/
