The Flash Season 2: Supergirl and Barry Allen team up in crossover episode extended promo

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The Flash and Supergirl team-up next week as Livewire returns to wreak havoc on National City! Watch the extended promo for the crossover episode below!

You've all seen Barry Allen visit National City in the Supergirl crossover episode photos, and now a brand new extended promo for the highly-anticipated crossover between Supergirl and The Flash has arrived! Episode 18 "Worlds Finest" will be the first meeting between the Girl of Steel and the scarlet speedster, and the new trailer teases a whole bunch of fun. The plot synopsis for the episode is as follows: "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."

This new trailer has given us a lot to sink our teeth into! Barry and Kara's banter is a joy to watch, and it looks like Flash will be helping Supergirl take down Livewire, who attacks Cat Grant and Kara in the promo. Silver Banshee doesn't feature in the teaser, but given the revelation at the end of this week's Supergirl that Siobhan had superpowers, we have a feeling that she's going to team up with Livewire to exact vengeance on Kara and Cat. Most intriguing, though, is how Barry got to National City. Barry didn't crossover into an alternate Earth at the end of "Trajectory", so will his excursion into Supergirl's world be self-contained or will it play a role in the Zoom arc of The Flash Season 2? We're hoping it's the latter, and with Grant Gustin saying he wants to set up an Arrow, Supergirl and Flash crossover event, something tells us it won't be the last time we see Kara and Barry cross paths! Are you excited for The Flash/Supergirl crossover?

Source: YouTube: @TVShowFan