As many of you figured, it seems Barry Allen/The Flash (Grant Gustin) will get lost during his travels through alternate universes and wind up in National City, where he'll team up with Supergirl (Melissa Benoist) to take on the combined threat of Silver Banshee (Italia Ricci) and returning baddie Livewire (Brit Morgan).
Take a look at the official poster and synopsis for "World's Finest" below.
“Worlds Finest” – 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.
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