Superman's Pal, Jimmy Olsen #140

Story 4: "Superman in Kandor, Part 1: Invasion of the Mystery Super-Men!"

Superman and Jimmy Olsen travel to Kandor to discover how normal sized Kandorians are on Earth and why they are attacking Superman.

Story 7: "Superman in Kandor] Part II: The Dynamic Duo of Kandor!"

Superman and Jimmy Olsen take the secret identites of Nightwing and Flamebird so they can track down Than-Ol's raiders and stop his scheme to enlarge Kandor.

Story 10: "Superman in Kandor] Part III: The City of Super-People!"

Than Ol succeeds in enlarging Kandor, but Superman must re-shrink it before Than-Ol's process destroys it completely.

Story 15: "The Caped Crimefighers of Kandor! Part I]"

Superman and Jimmy Olsen travel to the Bottle City of Kandor to become Nightwing and Flamebird and stop an outlaw with super-powers who is stealing artifacts.

Story 18: "The Caped Crimefighters of Kandor!] Part II: The Super-Showdown in Kandor!"

Nightwing and Flamebird discover the identity of Super-Outlaw, and also find out who is behind his crime spree.

Story 20: "The World of Doomed Olsens!"

Jimmy is taken by The Collector to the world Gion-El, which is seemingly inhabited by duplicates of him in the forms into which he has been transformed in the past. But when Jimmy realizes he is being hoaxed, the Legionnaires reveal that he has passed his initiation test and they bring him to the 30th century to officially be made an honorary member of the Legion of Super-Heroes.