Supergirl S1E18 'Worlds Finest' Sneak Peek
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.
Video Type: Not Available
Genre: Action, Drama, Adventure, Science Fiction
Release Date: Oct 26th, 2015