Masked Manhunters Meet Mighty Mites' Miniature Metropolises

The Dynamic Duo had numerous adventures with the Metropolis Marvel, Superman, and his pal Jimmy Olsen... in both of their cities and across Earth-One... even in space! However, the first time that Superman brought Batman and Robin to his homeworld's last city, Kandor... was a memorable occasion.

During a case together, a bullet ricochetted off the chest of Superman and into his best friend. After an emergency surgery extracting the bullet, Batman physically recovered from his ordeal yet psychologically was traumatized. Thinking he wasn't a worthy partner to Superman, the Dark Knight announced his retirement. In order to help Batman regain his senses and his courage, Superman hatched a scheme with his friend, the Kandorian administrator Than-Ar. 

While bringing Batman, Robin and Jimmy to his Fortress of Solitude on a false pretense, Superman asked for their assistance in tracking down a menace that had reappeared, the Metalloids. An ancient science that transformed men into invulnerable metal while its human host wears a force-radiating instrument, it now terrorized the Kryptonian city which had been shrunken by the alien android known as Brainiac.

After encountering an exceptionally violent Metalloid which threatened the now-powerless* Superman's life, Batman learned this was a ploy by his friend to help him regain his confidence since they were both normal within Kandor's controlled bottle environment.  Although a brief rift formed between the two heroes, they batched up their differences when they combined their efforts to bring the Metalloid Kandorians and their leader, Than-Ar's brother, Jhan-Ar, to justice. 

There was no surviving city of Kandor on Earth-Two, aside from the virtual version contained within the artificial conscience of Kara "Power Girl" Zor-L's Symbioship which brought her to her new home world. However, just as there were a generation of Kandorians born and raised all their lives in a shrunken state within the Bottled City of Kandor a universe away, so to there was a generation of humans likewise miniaturized within the small city known as Midget Town. 

While a chemical formula was used by Darrell Dane to transform into the 6 foot tall Doll Man, in the early 1940s the malevolent mastermind known as Brain Wave developed a purple ray which accomplished this feat. A variation of these treatments was later used on a village by another criminal scientist named Doctor Vargo. Doll Man became aware of these tiny folk, causing them to turn on their creator Thinking this town was destroyed, Dane never revisited it, as it developed into the more civilized Midget Town within a few short years.

When full-sized criminals led by Moose Miller raid the defenseless town, one of its inhabitants named Johnny Wister sought to bring those crooks to justice. This led him into a meeting with Batman and Robin, who along with Johnny and other residents of Midget Town (including Mayor Hawkins and his daughter Carol) accompany the Dynamic Duo back to Gotham City. Together, they track down the hoodlums and capture them.