The March 28 episode of Supergirl, “World’s Finest,” features a crossover with The CW’s series The Flash, as Barry Allen (Grant Gustin) and his speedy superhero alter ego The Flash head to National City to join forces with Supergirl (Melissa Benoist). The Flash suddenly appears from an alternate universe to help Supergirl battle Siobhan Smythe (recurring guest star Italia Ricci), a.k.a. Silver Banshee, and Leslie Willis (recurring guest star Brit Morgan), a.k.a. Livewire, in exchange for her help in finding a way to return him home. Supergirl: “World’s Finest” premieres on CBS Monday, March 28, at 8pm ET/PT.
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