 Even so, there were some elements which were unique to the cartoons, such as secondary characters in the "Hawkman", "Green Lantern" and "Atom" shorts.This series marked the animation debut of nearly all of its featured characters and teams.The exceptions were Superman and his supporting cast, who had been previously immortalized in the iconic 1940s Superman shorts (and later in "The New Adventures of Superman"), and the Superboy characters, seen in the previous season of "The Adventures of Superboy".