Justice League Action - Season 1 - Eps 20: Freezer Burn
Mr. Freeze flies on his aircraft to freeze the entire Gotham City using Killer Frost as his power source. While Batman deals with Mr. Freeze, Firestorm will have to save Killer Frost and develops a crush on her at the same time.
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.