The stories that introduced the Legion of Super-Heroes, from its original incarnation as a trio of heroes from the 30th century. Along the way, the team faces the escaped Kryptonian villains of the Phantom Zone and adds new heroes! Collects stories from ADVENTURE COMICS #247, 267, 282, 290, 293 and 300-310, ACTION COMICS #267, 276, 287 and 289, SUPERBOY #86, 89 and 98 and SUPERMAN #147.