What's happening?

Supergirl: 1x18

Worlds Finest

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.

Supergirl: 1×18
Supergirl: 1×18
Supergirl: 1×18
Supergirl: 1×18
Supergirl: 1×18
Supergirl: 1×18
Supergirl: 1×18
Supergirl: 1×18
Supergirl: 1×18
Supergirl: 1×18
Mar. 28, 2016