Starting with the founding trio of Cosmic Boy, Lightning Lad, and Saturn Girl, all versions of the team include teenage superheroes from several planets and alien races.
Introduced in Adventure Comics #247 (April 1958), the original version of the team appeared in various titles for 36 years until Legion of Super-Heroes (vol.
Batch SW6's roster was equivalent to the original Legion's membership immediately following the team's first encounter with Universo,[note 3] with Valor and Laurel Gand replacing Superboy, Mon-El and Supergirl (with all three of Triplicate Girl's bodies intact).
[1] Additionally, five non-SW6 members joined: Computo (Danielle Foccart), Dragonmage, Catspaw, Kid Quantum, and Reep Daggle (Chameleon).
It was revealed in Final Crisis: Legion of 3 Worlds #5 (September 2009) that this version of the team inhabits Earth-Prime, the home of supervillain Superboy-Prime.