Supergirl - Season 1 Episode 18: Worlds Finest
2016-03-28
- Drama / Sci-Fi & Fantasy / Action & Adventure
Kara gains a new ally when the lightning-fast superhero The Flash suddenly appears from an alternate universe and helps Kara battle Siobhan, aka Silver Banshee, and Livewire in exchange for her help in finding a way to return him home..
