Justice League Action - Season 1 - Eps 24: Battle for the Bottled City
The Atom shrinks Superman down to microscopic size so that he can enter the Bottled City of Kandor but when Brainiac breaks into the Fortress of Solitude, defeats Cyborg, and reclaims the bottle, Atom must try to stop Brainiac on his own.
About Justice League Action

Title: Justice League Action
First Air Date: 2016-12-16
Last Air Date: 2018-02-10
Status: Ended
Rating: 7/10 (from 84 votes)
Language: EN
Seasons: 2
Total Episodes: 52
Network: Cartoon Network
Genres: Animation, Action & Adventure, Sci-Fi & Fantasy, Kids
Production Companies: DC Entertainment, Warner Bros. Animation
Synopsis
Batman, Superman and Wonder Woman lead the DC Super Heroes against their most infamous foes.