It was the "Adventure Comics" run which established the Legion's general workings and environment. A club of teenagers, they operated out of a clubhouse in the shape of an inverted yellow rocket ship which looked as if it had been driven into the ground. The position of Legion leader rotated among the membership. Each Legionnaire had to possess one natural superpower which no other member possessed; despite this, several members had overlapping powers, particularly Superboy, Supergirl, Mon-El, and Ultra Boy. Some issues included comical moments where candidates with bizarre, useless, or dangerous abilities would try out for membership and be rejected; five of these flawed candidates went on to form the Legion of Substitute Heroes. The Legion was based on Earth and protected an organization of humans and aliens called the United Planets alongside the regular police the Science Police. The setting for each story was 1000 years from the date of publication.