One thousand years from now, a group of superpowered teenagers is inspired by Superman’s legacy. They band together and form the Legion of Super-Heroes, a crime-fighting group dedicated to protecting the citizens of the United Planets. One of these teens is Brainiac 5, a highly intelligent descendant of Superman’s arch foe, the original Brainiac.
Like many people in the 31st Century, members of the Legion idolize Superman. They frequent the Superman Museum and marvel at tales of his past. A few of them even travel back in time to Clark Kent’s teenage years. They recruit him to their team, thereby jumpstarting the adventures of Superboy, the Boy of Steel.