Supergirl Season 1 Episode 18 – Worlds Finest

Aired : Mar 28 2016 | 506 Views | 26 Link Submissions |

Watch Supergirl season 1 episode 18 online for free. Supergirl meets the Flash. Kara gains a new ally when the lightning-fast superhero The Flash (Grant Gustin) 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.