Justice League Action S01E24 - Battle for the Bottled City

"Battle for the Bottled City" After the events of "Plastic Man Saves the World," Atom shrinks Superman down to microscopic size so that he can enter the Bottled City of Kandor that was previously in Brainiac's possession. When Brainiac breaks into the Fortress of Solitude, defeats Cyborg, and reclaims the bottle, Atom must try to stop Brainiac all on his own with the help of some Superman robots.