In 1958, a Superboy story called "The Legion of Super-Heroes" in "Adventure Comics" #247 changed all that. The story features three super-powered teenagers from the 30th century who offer Superboy membership in their superhero club, the Legion of Super-Heroes. Although this was intended as a one-shot tale, the three future teens returned as guest stars in late 1959, and over the next three years, the Legion appeared periodically in Superboy, Supergirl (who also joined the Legion), and even Superman stories. The team membership also exploded from the initial three members to nearly twenty. Finally, the Legion got its own feature, starting in "Adventure Comics" #300 (1962), with Superboy usually, but not always, appearing as part of the team.