Supergirl S1 · EP18
Worlds Finest
7.3 · 2015 · Drama,Sci-Fi & Fantasy,Action & Adventure · ~43m
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.
