

S01E18
World's Finest
Aired March 28, 2016
Free, with no ads. Tick off what you watch and see what airs next.
Summary
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.
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