Full disclosure: I haven't watched CBS' Supergirl in about three months because it was incredibly lousy. But apparently the show has vastly improved, and with the upcoming crossover with The Flash now is the time to start playing catch up. CBS has dropped the first promo and images from the initial meeting between Supergirl (Melissa Benoist) and Barry Allen (Grant Gustin) in Supergirl's 18th episode, appropriately titled "World's Finest". Here's the episode's synopsis:
“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.”
"World's Finest" is set to air on Monday night, March 28th, at 8pm on CBS.