On his official website, Dwayne McDuffie addressed lingering questions about some of the heroes included/left out of the series. Firestorm (from the Super Powers series) was considered until Waverider was added and a new Firestorm was created in the comic. Black Lightning was in one of the original pitches until DC Comics refused to allow him to be in any animated series. Robin, Batgirl and other Batman-related characters are on a banned from the series list by DC. Steel II, Vibe, and Hawk & Dove are in the series since they never died in the animated DC Universe. All four are dead comic bookwise.