In these 1960s stories the Legion of Super-Heroes meets the team of villains who never lose! Plus, witness 'The Revolt of The Super-Pets'! Discover 'Chameleon Boy's Secret Identity'! And unravel the mystery of 'The Legionnaires Who Never Were'! Collects stories from Adventure Comics #361-380, Action Comics #378-392, Superboy #147, and Superman's Pal, Jimmy Olsen #106."