Season 1 • Episode 18
Worlds Finest
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2016-03-28
★ 7.3
43 min
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.
Guest Stars
Jenna Dewan
Chris Vance
Brit Morgan
Harriet Sansom Harris
Grant Gustin
Christopher Showerman
Italia Ricci
Jay Jackson
Sarah Robson
Dan Warner