The episode is called “World’s Finest” and today we have a collection of photos from the set of the Supergirl and The Flash crossover episode has hit the internet featuring Melissa Benoist and Grant Gustin. “World’s Finest” is set to air on March 28th. There are no major plot details that have been revealed at this time, but it will “bring Barry Allen to National City to meet titular heroine Kara Danvers” and you can bet they’ll have their hands full with Silver Banshee and Livewire.